31940012 has 24 divisors (see below), whose sum is σ = 60387600. Its totient is φ = 14694336.

The previous prime is 31940009. The next prime is 31940017. The reversal of 31940012 is 21004913.

It is not an unprimeable number, because it can be changed into a prime (31940017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19439 + ... + 21017.

It is an arithmetic number, because the mean of its divisors is an integer number (2516150).

Almost surely, 2^31940012 is an apocalyptic number.

It is an amenable number.

31940012 is a deficient number, since it is larger than the sum of its proper divisors (28447588).

31940012 is a wasteful number, since it uses less digits than its factorization.

31940012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1985 (or 1983 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 31940012 is about 5651.5495220338. The cubic root of 31940012 is about 317.2817008518.

Adding to 31940012 its reverse (21004913), we get a palindrome (52944925).

The spelling of 31940012 in words is "thirty-one million, nine hundred forty thousand, twelve".