31643396 has 6 divisors (see below), whose sum is σ = 55375950. Its totient is φ = 15821696.

The previous prime is 31643389. The next prime is 31643407. The reversal of 31643396 is 69334613.

It can be written as a sum of positive squares in only one way, i.e., 21808900 + 9834496 = 4670^2 + 3136^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3955421 + ... + 3955428.

It is an arithmetic number, because the mean of its divisors is an integer number (9229325).

Almost surely, 2^31643396 is an apocalyptic number.

It is an amenable number.

31643396 is a deficient number, since it is larger than the sum of its proper divisors (23732554).

31643396 is a wasteful number, since it uses less digits than its factorization.

31643396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7910853 (or 7910851 counting only the distinct ones).

The product of its digits is 34992, while the sum is 35.

The square root of 31643396 is about 5625.2463057185. The cubic root of 31643396 is about 316.2964824114.

The spelling of 31643396 in words is "thirty-one million, six hundred forty-three thousand, three hundred ninety-six".