31963640 has 16 divisors (see below), whose sum is σ = 71918280. Its totient is φ = 12785440.

The previous prime is 31963601. The next prime is 31963667. The reversal of 31963640 is 4636913.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31963597 and 31963606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 399506 + ... + 399585.

Almost surely, 2^31963640 is an apocalyptic number.

It is an amenable number.

31963640 is an abundant number, since it is smaller than the sum of its proper divisors (39954640).

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

31963640 is a wasteful number, since it uses less digits than its factorization.

31963640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799102 (or 799098 counting only the distinct ones).

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

The square root of 31963640 is about 5653.6395357327. The cubic root of 31963640 is about 317.3599191922.

The spelling of 31963640 in words is "thirty-one million, nine hundred sixty-three thousand, six hundred forty".