31693930 has 16 divisors (see below), whose sum is σ = 57574440. Its totient is φ = 12560832.

The previous prime is 31693927. The next prime is 31693969. The reversal of 31693930 is 3939613.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 30437289 + 1256641 = 5517^2 + 1121^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13449 + ... + 15628.

Almost surely, 2^31693930 is an apocalyptic number.

31693930 is a deficient number, since it is larger than the sum of its proper divisors (25880510).

31693930 is a wasteful number, since it uses less digits than its factorization.

31693930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29193.

The product of its (nonzero) digits is 13122, while the sum is 34.

The square root of 31693930 is about 5629.7362282793. The cubic root of 31693930 is about 316.4647663444.

It can be divided in two parts, 316939 and 30, that added together give a square (316969 = 563²).

The spelling of 31693930 in words is "thirty-one million, six hundred ninety-three thousand, nine hundred thirty".