31390696 has 8 divisors (see below), whose sum is σ = 58857570. Its totient is φ = 15695344.

The previous prime is 31390691. The next prime is 31390727. The reversal of 31390696 is 69609313.

It can be written as a sum of positive squares in only one way, i.e., 17056900 + 14333796 = 4130^2 + 3786^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (31390691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1961911 + ... + 1961926.

Almost surely, 2^31390696 is an apocalyptic number.

It is an amenable number.

31390696 is a deficient number, since it is larger than the sum of its proper divisors (27466874).

31390696 is a wasteful number, since it uses less digits than its factorization.

31390696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3923843 (or 3923839 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 37.

The square root of 31390696 is about 5602.7400439428. The cubic root of 31390696 is about 315.4522637602.

The spelling of 31390696 in words is "thirty-one million, three hundred ninety thousand, six hundred ninety-six".