31399330 has 16 divisors (see below), whose sum is σ = 56583864. Its totient is φ = 12545280.

The previous prime is 31399237. The next prime is 31399367. The reversal of 31399330 is 3399313.

It can be written as a sum of positive squares in 4 ways, for example, as 31169889 + 229441 = 5583^2 + 479^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31399292 and 31399301.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13450 + ... + 15610.

Almost surely, 2^31399330 is an apocalyptic number.

31399330 is a deficient number, since it is larger than the sum of its proper divisors (25184534).

31399330 is a wasteful number, since it uses less digits than its factorization.

31399330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3621.

The product of its (nonzero) digits is 6561, while the sum is 31.

The square root of 31399330 is about 5603.5105068162. The cubic root of 31399330 is about 315.4811827874.

The spelling of 31399330 in words is "thirty-one million, three hundred ninety-nine thousand, three hundred thirty".