31398040 has 32 divisors (see below), whose sum is σ = 72927360. Its totient is φ = 12153600.

The previous prime is 31398019. The next prime is 31398053. The reversal of 31398040 is 4089313.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

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, 11421 + ... + 13900.

It is an arithmetic number, because the mean of its divisors is an integer number (2278980).

Almost surely, 2^31398040 is an apocalyptic number.

It is an amenable number.

31398040 is an abundant number, since it is smaller than the sum of its proper divisors (41529320).

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

31398040 is a wasteful number, since it uses less digits than its factorization.

31398040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25363 (or 25359 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 31398040 is about 5603.3953992200. The cubic root of 31398040 is about 315.4768623523.

The spelling of 31398040 in words is "thirty-one million, three hundred ninety-eight thousand, forty".