31666396 has 12 divisors (see below), whose sum is σ = 55474552. Its totient is φ = 15816528.

The previous prime is 31666379. The next prime is 31666399. The reversal of 31666396 is 69366613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31666399) 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, 751 + ... + 7993.

Almost surely, 2^31666396 is an apocalyptic number.

It is an amenable number.

31666396 is a deficient number, since it is larger than the sum of its proper divisors (23808156).

31666396 is a wasteful number, since it uses less digits than its factorization.

31666396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8340 (or 8338 counting only the distinct ones).

The product of its digits is 104976, while the sum is 40.

The square root of 31666396 is about 5627.2902892956. The cubic root of 31666396 is about 316.3730972100.

The spelling of 31666396 in words is "thirty-one million, six hundred sixty-six thousand, three hundred ninety-six".