31399679 has 8 divisors (see below), whose sum is σ = 31943808. Its totient is φ = 30858520.

The previous prime is 31399661. The next prime is 31399729. The reversal of 31399679 is 97699313.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31399679 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 (31399639) 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, 32684 + ... + 33630.

It is an arithmetic number, because the mean of its divisors is an integer number (3992976).

Almost surely, 2^31399679 is an apocalyptic number.

31399679 is a deficient number, since it is larger than the sum of its proper divisors (544129).

31399679 is an equidigital number, since it uses as much as digits as its factorization.

31399679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1485.

The product of its digits is 275562, while the sum is 47.

The square root of 31399679 is about 5603.5416479223. The cubic root of 31399679 is about 315.4823516290.

The spelling of 31399679 in words is "thirty-one million, three hundred ninety-nine thousand, six hundred seventy-nine".