31869438 has 16 divisors (see below), whose sum is σ = 64022400. Its totient is φ = 10575896.

The previous prime is 31869437. The next prime is 31869443. The reversal of 31869438 is 83496813.

It is a happy number.

It is a super-2 number, since 2×31869438² = 2031322156871688, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 31869438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31869437) 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, 10338 + ... + 13061.

It is an arithmetic number, because the mean of its divisors is an integer number (4001400).

Almost surely, 2^31869438 is an apocalyptic number.

31869438 is an abundant number, since it is smaller than the sum of its proper divisors (32152962).

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

31869438 is a wasteful number, since it uses less digits than its factorization.

31869438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23631.

The product of its digits is 124416, while the sum is 42.

The square root of 31869438 is about 5645.3022948289. The cubic root of 31869438 is about 317.0478421292.

The spelling of 31869438 in words is "thirty-one million, eight hundred sixty-nine thousand, four hundred thirty-eight".