23402340 has 144 divisors (see below), whose sum is σ = 78060528. Its totient is φ = 5640192.

The previous prime is 23402299. The next prime is 23402347. The reversal of 23402340 is 4320432.

It can be written as a sum of positive squares in 8 ways, for example, as 820836 + 22581504 = 906^2 + 4752^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23402347) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 170752 + ... + 170888.

It is an arithmetic number, because the mean of its divisors is an integer number (542087).

Almost surely, 2^23402340 is an apocalyptic number.

23402340 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 23402340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39030264).

23402340 is an abundant number, since it is smaller than the sum of its proper divisors (54658188).

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

23402340 is a wasteful number, since it uses less digits than its factorization.

23402340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238 (or 233 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 18.

The square root of 23402340 is about 4837.5965106652. The cubic root of 23402340 is about 286.0353844756.

Adding to 23402340 its reverse (4320432), we get a palindrome (27722772).

The spelling of 23402340 in words is "twenty-three million, four hundred two thousand, three hundred forty".