31897952 has 12 divisors (see below), whose sum is σ = 62799156. Its totient is φ = 15948960.

The previous prime is 31897951. The next prime is 31897969. The reversal of 31897952 is 25979813.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31897951) 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 as a sum of consecutive naturals, namely, 498374 + ... + 498437.

It is an arithmetic number, because the mean of its divisors is an integer number (5233263).

Almost surely, 2^31897952 is an apocalyptic number.

31897952 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31897952 is a deficient number, since it is larger than the sum of its proper divisors (30901204).

31897952 is an equidigital number, since it uses as much as digits as its factorization.

31897952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996821 (or 996813 counting only the distinct ones).

The product of its digits is 136080, while the sum is 44.

The square root of 31897952 is about 5647.8271928238. The cubic root of 31897952 is about 317.1423695503.

The spelling of 31897952 in words is "thirty-one million, eight hundred ninety-seven thousand, nine hundred fifty-two".