31993970 has 16 divisors (see below), whose sum is σ = 57656448. Its totient is φ = 12782640.

The previous prime is 31993961. The next prime is 31993979. The reversal of 31993970 is 7939913.

It is an interprime number because it is at equal distance from previous prime (31993961) and next prime (31993979).

It is a super-2 number, since 2×31993970² = 2047228232721800, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31993979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12065 + ... + 14475.

It is an arithmetic number, because the mean of its divisors is an integer number (3603528).

Almost surely, 2^31993970 is an apocalyptic number.

31993970 is a deficient number, since it is larger than the sum of its proper divisors (25662478).

31993970 is a wasteful number, since it uses less digits than its factorization.

31993970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3745.

The product of its (nonzero) digits is 45927, while the sum is 41.

The square root of 31993970 is about 5656.3212426453. The cubic root of 31993970 is about 317.4602674152.

The spelling of 31993970 in words is "thirty-one million, nine hundred ninety-three thousand, nine hundred seventy".