31730540 has 12 divisors (see below), whose sum is σ = 66634176. Its totient is φ = 12692208.

The previous prime is 31730537. The next prime is 31730549. The reversal of 31730540 is 4503713.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (31730549) 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 3 ways as a sum of consecutive naturals, for example, 793244 + ... + 793283.

It is an arithmetic number, because the mean of its divisors is an integer number (5552848).

Almost surely, 2^31730540 is an apocalyptic number.

It is an amenable number.

31730540 is an abundant number, since it is smaller than the sum of its proper divisors (34903636).

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

31730540 is a wasteful number, since it uses less digits than its factorization.

31730540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1586536 (or 1586534 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 31730540 is about 5632.9867743498. The cubic root of 31730540 is about 316.5865700778.

The spelling of 31730540 in words is "thirty-one million, seven hundred thirty thousand, five hundred forty".