31457040 has 40 divisors (see below), whose sum is σ = 97517568. Its totient is φ = 8388480.

The previous prime is 31457039. The next prime is 31457051. The reversal of 31457040 is 4075413.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 31457040.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65296 + ... + 65775.

Almost surely, 2^31457040 is an apocalyptic number.

31457040 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31457040 is an abundant number, since it is smaller than the sum of its proper divisors (66060528).

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

31457040 is a wasteful number, since it uses less digits than its factorization.

31457040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131087 (or 131081 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 31457040 is about 5608.6575933997. The cubic root of 31457040 is about 315.6743427088.

The spelling of 31457040 in words is "thirty-one million, four hundred fifty-seven thousand, forty".