31400316 has 18 divisors (see below), whose sum is σ = 79373112. Its totient is φ = 10466760.

The previous prime is 31400297. The next prime is 31400321. The reversal of 31400316 is 61300413.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 436080 + ... + 436151.

Almost surely, 2^31400316 is an apocalyptic number.

31400316 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

31400316 is an abundant number, since it is smaller than the sum of its proper divisors (47972796).

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

31400316 is a wasteful number, since it uses less digits than its factorization.

31400316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872241 (or 872236 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 31400316 is about 5603.5984866869. The cubic root of 31400316 is about 315.4844849936.

Adding to 31400316 its reverse (61300413), we get a palindrome (92700729).

The spelling of 31400316 in words is "thirty-one million, four hundred thousand, three hundred sixteen".