31879397 has 8 divisors (see below), whose sum is σ = 36608160. Its totient is φ = 27455760.

The previous prime is 31879391. The next prime is 31879399. The reversal of 31879397 is 79397813.

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

It is not a de Polignac number, because 31879397 - 2¹⁰ = 31878373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31879391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76058 + ... + 76475.

It is an arithmetic number, because the mean of its divisors is an integer number (4576020).

Almost surely, 2^31879397 is an apocalyptic number.

It is an amenable number.

31879397 is a deficient number, since it is larger than the sum of its proper divisors (4728763).

31879397 is a wasteful number, since it uses less digits than its factorization.

31879397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152563.

The product of its digits is 285768, while the sum is 47.

The square root of 31879397 is about 5646.1842867551. The cubic root of 31879397 is about 317.0808638455.

The spelling of 31879397 in words is "thirty-one million, eight hundred seventy-nine thousand, three hundred ninety-seven".