31974940 has 24 divisors (see below), whose sum is σ = 67474512. Its totient is φ = 12727680.

The previous prime is 31974913. The next prime is 31974947. The reversal of 31974940 is 4947913.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 31974940.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31974947) 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, 432 + ... + 8008.

It is an arithmetic number, because the mean of its divisors is an integer number (2811438).

Almost surely, 2^31974940 is an apocalyptic number.

It is an amenable number.

31974940 is an abundant number, since it is smaller than the sum of its proper divisors (35499572).

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

31974940 is a wasteful number, since it uses less digits than its factorization.

31974940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7797 (or 7795 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 31974940 is about 5654.6388036726. The cubic root of 31974940 is about 317.3973131870.

The spelling of 31974940 in words is "thirty-one million, nine hundred seventy-four thousand, nine hundred forty".