31397974 has 8 divisors (see below), whose sum is σ = 48099168. Its totient is φ = 15364920.

The previous prime is 31397939. The next prime is 31397999. The reversal of 31397974 is 47979313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 31397974.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166917 + ... + 167104.

It is an arithmetic number, because the mean of its divisors is an integer number (6012396).

Almost surely, 2^31397974 is an apocalyptic number.

31397974 is a deficient number, since it is larger than the sum of its proper divisors (16701194).

31397974 is a wasteful number, since it uses less digits than its factorization.

31397974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334070.

The product of its digits is 142884, while the sum is 43.

The square root of 31397974 is about 5603.3895099306. The cubic root of 31397974 is about 315.4766413036.

The spelling of 31397974 in words is "thirty-one million, three hundred ninety-seven thousand, nine hundred seventy-four".