31397882 has 16 divisors (see below), whose sum is σ = 48408192. Its totient is φ = 15264480.

The previous prime is 31397881. The next prime is 31397911. The reversal of 31397882 is 28879313.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is not an unprimeable number, because it can be changed into a prime (31397881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37553 + ... + 38379.

It is an arithmetic number, because the mean of its divisors is an integer number (3025512).

Almost surely, 2^31397882 is an apocalyptic number.

31397882 is a deficient number, since it is larger than the sum of its proper divisors (17010310).

31397882 is a wasteful number, since it uses less digits than its factorization.

31397882 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333.

The product of its digits is 72576, while the sum is 41.

The square root of 31397882 is about 5603.3813006077. The cubic root of 31397882 is about 315.4763331746.

Subtracting from 31397882 its reverse (28879313), we obtain a square (2518569 = 1587²).

The spelling of 31397882 in words is "thirty-one million, three hundred ninety-seven thousand, eight hundred eighty-two".