31140972 has 36 divisors (see below), whose sum is σ = 79135056. Its totient is φ = 10325280.

The previous prime is 31140929. The next prime is 31140979. The reversal of 31140972 is 27904113.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (31140979) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4897 + ... + 9287.

It is an arithmetic number, because the mean of its divisors is an integer number (2198196).

Almost surely, 2^31140972 is an apocalyptic number.

It is an amenable number.

31140972 is an abundant number, since it is smaller than the sum of its proper divisors (47994084).

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

31140972 is a wasteful number, since it uses less digits than its factorization.

31140972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4598 (or 4593 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 31140972 is about 5580.4096623814. The cubic root of 31140972 is about 314.6135245130.

The spelling of 31140972 in words is "thirty-one million, one hundred forty thousand, nine hundred seventy-two".