31890965 has 8 divisors (see below), whose sum is σ = 38430720. Its totient is φ = 25405072.

The previous prime is 31890959. The next prime is 31890979. The reversal of 31890965 is 56909813.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31890965 - 2⁸ = 31890709 is a prime.

It is a congruent number.

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, 12149 + ... + 14538.

It is an arithmetic number, because the mean of its divisors is an integer number (4803840).

Almost surely, 2^31890965 is an apocalyptic number.

It is an amenable number.

31890965 is a deficient number, since it is larger than the sum of its proper divisors (6539755).

31890965 is a wasteful number, since it uses less digits than its factorization.

31890965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26931.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 31890965 is about 5647.2086024867. The cubic root of 31890965 is about 317.1192119972.

The spelling of 31890965 in words is "thirty-one million, eight hundred ninety thousand, nine hundred sixty-five".