31890265 has 16 divisors (see below), whose sum is σ = 43945920. Its totient is φ = 21971520.

The previous prime is 31890233. The next prime is 31890281. The reversal of 31890265 is 56209813.

It is not a de Polignac number, because 31890265 - 2⁵ = 31890233 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31890265.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14214 + ... + 16303.

It is an arithmetic number, because the mean of its divisors is an integer number (2746620).

Almost surely, 2^31890265 is an apocalyptic number.

It is an amenable number.

31890265 is a deficient number, since it is larger than the sum of its proper divisors (12055655).

31890265 is a wasteful number, since it uses less digits than its factorization.

31890265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30552.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 31890265 is about 5647.1466246238. The cubic root of 31890265 is about 317.1168917468.

The spelling of 31890265 in words is "thirty-one million, eight hundred ninety thousand, two hundred sixty-five".