31203972 has 18 divisors (see below), whose sum is σ = 78876798. Its totient is φ = 10401312.

The previous prime is 31203961. The next prime is 31203983. The reversal of 31203972 is 27930213.

It is an interprime number because it is at equal distance from previous prime (31203961) and next prime (31203983).

It can be written as a sum of positive squares in only one way, i.e., 31203396 + 576 = 5586^2 + 24^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 433353 + ... + 433424.

Almost surely, 2^31203972 is an apocalyptic number.

It is an amenable number.

31203972 is an abundant number, since it is smaller than the sum of its proper divisors (47672826).

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

31203972 is a wasteful number, since it uses less digits than its factorization.

31203972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866787 (or 866782 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 31203972 is about 5586.0515572272. The cubic root of 31203972 is about 314.8255420969.

The spelling of 31203972 in words is "thirty-one million, two hundred three thousand, nine hundred seventy-two".