31440012 has 24 divisors (see below), whose sum is σ = 73850112. Its totient is φ = 10410000.

The previous prime is 31440001. The next prime is 31440049. The reversal of 31440012 is 21004413.

It is a junction number, because it is equal to n+sod(n) for n = 31439973 and 31440000.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6864 + ... + 10487.

It is an arithmetic number, because the mean of its divisors is an integer number (3077088).

Almost surely, 2^31440012 is an apocalyptic number.

It is an amenable number.

31440012 is an abundant number, since it is smaller than the sum of its proper divisors (42410100).

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

31440012 is a wasteful number, since it uses less digits than its factorization.

31440012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17509 (or 17507 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 31440012 is about 5607.1393776149. The cubic root of 31440012 is about 315.6173732366.

Adding to 31440012 its reverse (21004413), we get a palindrome (52444425).

The spelling of 31440012 in words is "thirty-one million, four hundred forty thousand, twelve".