31640906 has 8 divisors (see below), whose sum is σ = 51776064. Its totient is φ = 14382220.

The previous prime is 31640899. The next prime is 31640911. The reversal of 31640906 is 60904613.

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

It is a super-2 number, since 2×31640906² = 2002293865001672, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 719090 + ... + 719133.

It is an arithmetic number, because the mean of its divisors is an integer number (6472008).

Almost surely, 2^31640906 is an apocalyptic number.

31640906 is a deficient number, since it is larger than the sum of its proper divisors (20135158).

31640906 is a wasteful number, since it uses less digits than its factorization.

31640906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1438236.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 31640906 is about 5625.0249777223. The cubic root of 31640906 is about 316.2881857998.

The spelling of 31640906 in words is "thirty-one million, six hundred forty thousand, nine hundred six".