31388996 has 6 divisors (see below), whose sum is σ = 54930750. Its totient is φ = 15694496.

The previous prime is 31388989. The next prime is 31388999. The reversal of 31388996 is 69988313.

It can be written as a sum of positive squares in only one way, i.e., 26894596 + 4494400 = 5186^2 + 2120^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31388996.

It is not an unprimeable number, because it can be changed into a prime (31388999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3923621 + ... + 3923628.

It is an arithmetic number, because the mean of its divisors is an integer number (9155125).

Almost surely, 2^31388996 is an apocalyptic number.

It is an amenable number.

31388996 is a deficient number, since it is larger than the sum of its proper divisors (23541754).

31388996 is a wasteful number, since it uses less digits than its factorization.

31388996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7847253 (or 7847251 counting only the distinct ones).

The product of its digits is 279936, while the sum is 47.

The square root of 31388996 is about 5602.5883304059. The cubic root of 31388996 is about 315.4465690948.

The spelling of 31388996 in words is "thirty-one million, three hundred eighty-eight thousand, nine hundred ninety-six".