31940689 has 4 divisors (see below), whose sum is σ = 34844400. Its totient is φ = 29036980.

The previous prime is 31940669. The next prime is 31940707. The reversal of 31940689 is 98604913.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31940689 - 2⁹ = 31940177 is a prime.

It is a super-2 number, since 2×31940689² = 2040415227589442, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31940659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1451839 + ... + 1451860.

It is an arithmetic number, because the mean of its divisors is an integer number (8711100).

Almost surely, 2^31940689 is an apocalyptic number.

It is an amenable number.

31940689 is a deficient number, since it is larger than the sum of its proper divisors (2903711).

31940689 is a wasteful number, since it uses less digits than its factorization.

31940689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2903710.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 31940689 is about 5651.6094167945. The cubic root of 31940689 is about 317.2839425353.

The spelling of 31940689 in words is "thirty-one million, nine hundred forty thousand, six hundred eighty-nine".