31008040 has 64 divisors (see below), whose sum is σ = 81129600. Its totient is φ = 10445568.

The previous prime is 31008037. The next prime is 31008041. The reversal of 31008040 is 4080013.

It is a super-2 number, since 2×31008040² = 1922997089283200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31008041) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 15582 + ... + 17458.

It is an arithmetic number, because the mean of its divisors is an integer number (1267650).

Almost surely, 2^31008040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31008040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40564800).

31008040 is an abundant number, since it is smaller than the sum of its proper divisors (50121560).

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

31008040 is a wasteful number, since it uses less digits than its factorization.

31008040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1954 (or 1950 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 31008040 is about 5568.4863293358. The cubic root of 31008040 is about 314.1652206341.

Adding to 31008040 its reverse (4080013), we get a palindrome (35088053).

The spelling of 31008040 in words is "thirty-one million, eight thousand, forty".