31139308 has 24 divisors (see below), whose sum is σ = 58054752. Its totient is φ = 14563584.

The previous prime is 31139299. The next prime is 31139323. The reversal of 31139308 is 80393113.

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, 10441 + ... + 13087.

It is an arithmetic number, because the mean of its divisors is an integer number (2418948).

Almost surely, 2^31139308 is an apocalyptic number.

It is an amenable number.

31139308 is a deficient number, since it is larger than the sum of its proper divisors (26915444).

31139308 is a wasteful number, since it uses less digits than its factorization.

31139308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2841 (or 2839 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 31139308 is about 5580.2605673929. The cubic root of 31139308 is about 314.6079206820.

It can be divided in two parts, 3113 and 9308, that added together give a palindrome (12421).

The spelling of 31139308 in words is "thirty-one million, one hundred thirty-nine thousand, three hundred eight".