31693990 has 16 divisors (see below), whose sum is σ = 57257280. Its totient is φ = 12631360.

The previous prime is 31693969. The next prime is 31694041. The reversal of 31693990 is 9939613.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2830 + ... + 8449.

It is an arithmetic number, because the mean of its divisors is an integer number (3578580).

Almost surely, 2^31693990 is an apocalyptic number.

31693990 is a deficient number, since it is larger than the sum of its proper divisors (25563290).

31693990 is a wasteful number, since it uses less digits than its factorization.

31693990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11567.

The product of its (nonzero) digits is 39366, while the sum is 40.

The square root of 31693990 is about 5629.7415571232. The cubic root of 31693990 is about 316.4649660448.

The spelling of 31693990 in words is "thirty-one million, six hundred ninety-three thousand, nine hundred ninety".