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23390740 = 2253121217
BaseRepresentation
bin101100100111…
…0101000010100
31122000101001201
41121032220110
521442000430
62153202244
7402550402
oct131165024
948011051
1023390740
111222689a
127a00384
134acc899
14316c472
1520c08ca
hex164ea14

23390740 has 36 divisors (see below), whose sum is σ = 50797908. Its totient is φ = 9047040.

The previous prime is 23390723. The next prime is 23390779. The reversal of 23390740 is 4709332.

It can be written as a sum of positive squares in 2 ways, for example, as 8133904 + 15256836 = 2852^2 + 3906^2 .

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 23390699 and 23390708.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18612 + ... + 19828.

It is an arithmetic number, because the mean of its divisors is an integer number (1411053).

Almost surely, 223390740 is an apocalyptic number.

23390740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23390740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25398954).

23390740 is an abundant number, since it is smaller than the sum of its proper divisors (27407168).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23390740 is a wasteful number, since it uses less digits than its factorization.

23390740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1288 (or 1255 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 23390740 is about 4836.3974195676. The cubic root of 23390740 is about 285.9881162845.

The spelling of 23390740 in words is "twenty-three million, three hundred ninety thousand, seven hundred forty".

Divisors: 1 2 4 5 10 20 31 62 124 155 310 620 961 1217 1922 2434 3844 4805 4868 6085 9610 12170 19220 24340 37727 75454 150908 188635 377270 754540 1169537 2339074 4678148 5847685 11695370 23390740