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31421730 = 2351047391
BaseRepresentation
bin111011111011…
…1010100100010
32012010101111210
41313313110202
531020443410
63041250550
7531036354
oct167672442
965111453
1031421730
111681167a
12a633a56
136682152
14425d0d4
152b5a220
hex1df7522

31421730 has 16 divisors (see below), whose sum is σ = 75412224. Its totient is φ = 8379120.

The previous prime is 31421713. The next prime is 31421737. The reversal of 31421730 is 3712413.

It is a junction number, because it is equal to n+sod(n) for n = 31421697 and 31421706.

It is not an unprimeable number, because it can be changed into a prime (31421737) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 523666 + ... + 523725.

It is an arithmetic number, because the mean of its divisors is an integer number (4713264).

Almost surely, 231421730 is an apocalyptic number.

31421730 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31421730 is an abundant number, since it is smaller than the sum of its proper divisors (43990494).

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

31421730 is a wasteful number, since it uses less digits than its factorization.

31421730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1047401.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 31421730 is about 5605.5088975043. The cubic root of 31421730 is about 315.5561854356.

The spelling of 31421730 in words is "thirty-one million, four hundred twenty-one thousand, seven hundred thirty".

Divisors: 1 2 3 5 6 10 15 30 1047391 2094782 3142173 5236955 6284346 10473910 15710865 31421730