31643404 has 12 divisors (see below), whose sum is σ = 59635744. Its totient is φ = 14604624.

The previous prime is 31643389. The next prime is 31643407. The reversal of 31643404 is 40434613.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (31643407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 304212 + ... + 304315.

Almost surely, 2^31643404 is an apocalyptic number.

It is an amenable number.

31643404 is a deficient number, since it is larger than the sum of its proper divisors (27992340).

31643404 is a wasteful number, since it uses less digits than its factorization.

31643404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608544 (or 608542 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 31643404 is about 5625.2470167985. The cubic root of 31643404 is about 316.2965090665.

The spelling of 31643404 in words is "thirty-one million, six hundred forty-three thousand, four hundred four".