31399100 has 18 divisors (see below), whose sum is σ = 68136264. Its totient is φ = 12559600.

The previous prime is 31399097. The next prime is 31399129. The reversal of 31399100 is 199313.

It is a self number, because there is not a number n which added to its sum of digits gives 31399100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 156896 + ... + 157095.

It is an arithmetic number, because the mean of its divisors is an integer number (3785348).

Almost surely, 2^31399100 is an apocalyptic number.

It is an amenable number.

31399100 is an abundant number, since it is smaller than the sum of its proper divisors (36737164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31399100 is a wasteful number, since it uses less digits than its factorization.

31399100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314005 (or 313998 counting only the distinct ones).

The product of its (nonzero) digits is 729, while the sum is 26.

The square root of 31399100 is about 5603.4899839297. The cubic root of 31399100 is about 315.4804124859.

The spelling of 31399100 in words is "thirty-one million, three hundred ninety-nine thousand, one hundred".