31914972 has 60 divisors (see below), whose sum is σ = 84157920. Its totient is φ = 10545984.

The previous prime is 31914959. The next prime is 31914977. The reversal of 31914972 is 27941913.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31914977) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 44029 + ... + 44747.

It is an arithmetic number, because the mean of its divisors is an integer number (1402632).

Almost surely, 2^31914972 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31914972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42078960).

31914972 is an abundant number, since it is smaller than the sum of its proper divisors (52242948).

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

31914972 is a wasteful number, since it uses less digits than its factorization.

31914972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872 (or 861 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 31914972 is about 5649.3337660294. Note that the first 3 decimals coincide. The cubic root of 31914972 is about 317.1987661007.

The spelling of 31914972 in words is "thirty-one million, nine hundred fourteen thousand, nine hundred seventy-two".