31488140 has 24 divisors (see below), whose sum is σ = 66810912. Its totient is φ = 12464640.

The previous prime is 31488137. The next prime is 31488161. The reversal of 31488140 is 4188413.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6176 + ... + 10055.

It is an arithmetic number, because the mean of its divisors is an integer number (2783788).

Almost surely, 2^31488140 is an apocalyptic number.

It is an amenable number.

31488140 is an abundant number, since it is smaller than the sum of its proper divisors (35322772).

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

31488140 is a wasteful number, since it uses less digits than its factorization.

31488140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16337 (or 16335 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 31488140 is about 5611.4294079138. The cubic root of 31488140 is about 315.7783389154.

The spelling of 31488140 in words is "thirty-one million, four hundred eighty-eight thousand, one hundred forty".