31906436 has 6 divisors (see below), whose sum is σ = 55836270. Its totient is φ = 15953216.

The previous prime is 31906429. The next prime is 31906507. The reversal of 31906436 is 63460913.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 27040000 + 4866436 = 5200^2 + 2206^2 .

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 as a sum of consecutive naturals, namely, 3988301 + ... + 3988308.

It is an arithmetic number, because the mean of its divisors is an integer number (9306045).

Almost surely, 2^31906436 is an apocalyptic number.

It is an amenable number.

31906436 is a deficient number, since it is larger than the sum of its proper divisors (23929834).

31906436 is a wasteful number, since it uses less digits than its factorization.

31906436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7976613 (or 7976611 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 31906436 is about 5648.5782281916. The cubic root of 31906436 is about 317.1704841802.

The spelling of 31906436 in words is "thirty-one million, nine hundred six thousand, four hundred thirty-six".