23431290 has 16 divisors (see below), whose sum is σ = 56235168. Its totient is φ = 6248336.

The previous prime is 23431283. The next prime is 23431301. The reversal of 23431290 is 9213432.

It is a super-4 number, since 4×23431290⁴ (a number of 31 digits) contains 4444 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 23431290.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 390492 + ... + 390551.

It is an arithmetic number, because the mean of its divisors is an integer number (3514698).

Almost surely, 2^23431290 is an apocalyptic number.

23431290 is an abundant number, since it is smaller than the sum of its proper divisors (32803878).

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

23431290 is a wasteful number, since it uses less digits than its factorization.

23431290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781053.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 23431290 is about 4840.5877742274. The cubic root of 23431290 is about 286.1532831152.

The spelling of 23431290 in words is "twenty-three million, four hundred thirty-one thousand, two hundred ninety".