31679397 has 16 divisors (see below), whose sum is σ = 48552000. Its totient is φ = 20390832.

The previous prime is 31679387. The next prime is 31679413. The reversal of 31679397 is 79397613.

It is not a de Polignac number, because 31679397 - 2¹⁴ = 31663013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31679377) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19447 + ... + 21012.

It is an arithmetic number, because the mean of its divisors is an integer number (3034500).

Almost surely, 2^31679397 is an apocalyptic number.

It is an amenable number.

31679397 is a deficient number, since it is larger than the sum of its proper divisors (16872603).

31679397 is a wasteful number, since it uses less digits than its factorization.

31679397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40497 (or 40491 counting only the distinct ones).

The product of its digits is 214326, while the sum is 45.

The square root of 31679397 is about 5628.4453448532. The cubic root of 31679397 is about 316.4163881470.

The spelling of 31679397 in words is "thirty-one million, six hundred seventy-nine thousand, three hundred ninety-seven".