31315040 has 48 divisors (see below), whose sum is σ = 77883120. Its totient is φ = 11865600.

The previous prime is 31315013. The next prime is 31315069. The reversal of 31315040 is 4051313.

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, 2111 + ... + 8190.

It is an arithmetic number, because the mean of its divisors is an integer number (1622565).

Almost surely, 2^31315040 is an apocalyptic number.

It is an amenable number.

31315040 is an abundant number, since it is smaller than the sum of its proper divisors (46568080).

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

31315040 is a wasteful number, since it uses less digits than its factorization.

31315040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10335 (or 10327 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 31315040 is about 5595.9842744597. The cubic root of 31315040 is about 315.1986317547.

Adding to 31315040 its reverse (4051313), we get a palindrome (35366353).

The spelling of 31315040 in words is "thirty-one million, three hundred fifteen thousand, forty".