31938636 has 12 divisors (see below), whose sum is σ = 74523512. Its totient is φ = 10646208.

The previous prime is 31938623. The next prime is 31938661. The reversal of 31938636 is 63683913.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 31938594 and 31938603.

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, 1330765 + ... + 1330788.

Almost surely, 2^31938636 is an apocalyptic number.

It is an amenable number.

31938636 is an abundant number, since it is smaller than the sum of its proper divisors (42584876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31938636 is a wasteful number, since it uses less digits than its factorization.

31938636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2661560 (or 2661558 counting only the distinct ones).

The product of its digits is 69984, while the sum is 39.

The square root of 31938636 is about 5651.4277841975. The cubic root of 31938636 is about 317.2771445407.

The spelling of 31938636 in words is "thirty-one million, nine hundred thirty-eight thousand, six hundred thirty-six".