23131390 has 16 divisors (see below), whose sum is σ = 44086032. Its totient is φ = 8708224.

The previous prime is 23131387. The next prime is 23131391. The reversal of 23131390 is 9313132.

It is a super-2 number, since 2×23131390² = 1070122406664200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23131391) 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, 67864 + ... + 68203.

It is an arithmetic number, because the mean of its divisors is an integer number (2755377).

Almost surely, 2^23131390 is an apocalyptic number.

23131390 is a deficient number, since it is larger than the sum of its proper divisors (20954642).

23131390 is a wasteful number, since it uses less digits than its factorization.

23131390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136091.

The product of its (nonzero) digits is 486, while the sum is 22.

The square root of 23131390 is about 4809.5103700897. The cubic root of 23131390 is about 284.9272000370.

The spelling of 23131390 in words is "twenty-three million, one hundred thirty-one thousand, three hundred ninety".