31897376 has 48 divisors (see below), whose sum is σ = 72305856. Its totient is φ = 13568256.

The previous prime is 31897373. The next prime is 31897399. The reversal of 31897376 is 67379813.

It is not an unprimeable number, because it can be changed into a prime (31897373) 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 7 ways as a sum of consecutive naturals, for example, 34715 + ... + 35621.

It is an arithmetic number, because the mean of its divisors is an integer number (1506372).

Almost surely, 2^31897376 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 31897376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36152928).

31897376 is an abundant number, since it is smaller than the sum of its proper divisors (40408480).

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

31897376 is a wasteful number, since it uses less digits than its factorization.

31897376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081 (or 1073 counting only the distinct ones).

The product of its digits is 190512, while the sum is 44.

The square root of 31897376 is about 5647.7761995320. The cubic root of 31897376 is about 317.1404605969.

The spelling of 31897376 in words is "thirty-one million, eight hundred ninety-seven thousand, three hundred seventy-six".