31670397 has 48 divisors (see below), whose sum is σ = 53352000. Its totient is φ = 17902080.

The previous prime is 31670369. The next prime is 31670413. The reversal of 31670397 is 79307613.

It is not a de Polignac number, because 31670397 - 2⁸ = 31670141 is a prime.

It is a super-2 number, since 2×31670397² = 2006028092275218, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31670357) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 212479 + ... + 212627.

It is an arithmetic number, because the mean of its divisors is an integer number (1111500).

Almost surely, 2^31670397 is an apocalyptic number.

It is an amenable number.

31670397 is a deficient number, since it is larger than the sum of its proper divisors (21681603).

31670397 is a wasteful number, since it uses less digits than its factorization.

31670397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298 (or 295 counting only the distinct ones).

The product of its (nonzero) digits is 23814, while the sum is 36.

The square root of 31670397 is about 5627.6457777653. The cubic root of 31670397 is about 316.3864210655.

The spelling of 31670397 in words is "thirty-one million, six hundred seventy thousand, three hundred ninety-seven".