31207972 has 6 divisors (see below), whose sum is σ = 54613958. Its totient is φ = 15603984.

The previous prime is 31207961. The next prime is 31207993. The reversal of 31207972 is 27970213.

It can be written as a sum of positive squares in only one way, i.e., 29528356 + 1679616 = 5434^2 + 1296^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3900993 + ... + 3901000.

Almost surely, 2^31207972 is an apocalyptic number.

It is an amenable number.

31207972 is a deficient number, since it is larger than the sum of its proper divisors (23405986).

31207972 is a wasteful number, since it uses less digits than its factorization.

31207972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7801997 (or 7801995 counting only the distinct ones).

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 31207972 is about 5586.4095804014. The cubic root of 31207972 is about 314.8389938926.

The spelling of 31207972 in words is "thirty-one million, two hundred seven thousand, nine hundred seventy-two".