31722972 has 12 divisors (see below), whose sum is σ = 74020296. Its totient is φ = 10574320.

The previous prime is 31722947. The next prime is 31722973. The reversal of 31722972 is 27922713.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31722973) 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, 1321779 + ... + 1321802.

It is an arithmetic number, because the mean of its divisors is an integer number (6168358).

Almost surely, 2^31722972 is an apocalyptic number.

It is an amenable number.

31722972 is an abundant number, since it is smaller than the sum of its proper divisors (42297324).

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

31722972 is a wasteful number, since it uses less digits than its factorization.

31722972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2643588 (or 2643586 counting only the distinct ones).

The product of its digits is 10584, while the sum is 33.

The square root of 31722972 is about 5632.3149769877. The cubic root of 31722972 is about 316.5613985588.

It can be divided in two parts, 31 and 722972, that added together give a triangular number (723003 = T₁₂₀₂).

The spelling of 31722972 in words is "thirty-one million, seven hundred twenty-two thousand, nine hundred seventy-two".