31965966 has 12 divisors (see below), whose sum is σ = 69259632. Its totient is φ = 10655316.

The previous prime is 31965959. The next prime is 31966061. The reversal of 31965966 is 66956913.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 887926 + ... + 887961.

It is an arithmetic number, because the mean of its divisors is an integer number (5771636).

Almost surely, 2^31965966 is an apocalyptic number.

31965966 is an abundant number, since it is smaller than the sum of its proper divisors (37293666).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31965966 is a wasteful number, since it uses less digits than its factorization.

31965966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1775895 (or 1775892 counting only the distinct ones).

The product of its digits is 262440, while the sum is 45.

The square root of 31965966 is about 5653.8452401883. The cubic root of 31965966 is about 317.3676171188.

Adding to 31965966 its product of digits (262440), we get a triangular number (32228406 = T₈₀₂₈).

The spelling of 31965966 in words is "thirty-one million, nine hundred sixty-five thousand, nine hundred sixty-six".