31320012 has 24 divisors (see below), whose sum is σ = 73357312. Its totient is φ = 10400400.

The previous prime is 31320011. The next prime is 31320041. The reversal of 31320012 is 21002313.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a self number, because there is not a number n which added to its sum of digits gives 31320012.

It is not an unprimeable number, because it can be changed into a prime (31320011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1564 + ... + 8067.

Almost surely, 2^31320012 is an apocalyptic number.

It is an amenable number.

31320012 is an abundant number, since it is smaller than the sum of its proper divisors (42037300).

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

31320012 is a wasteful number, since it uses less digits than its factorization.

31320012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9909 (or 9907 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 31320012 is about 5596.4285039657. The cubic root of 31320012 is about 315.2153126069.

Adding to 31320012 its reverse (21002313), we get a palindrome (52322325).

The spelling of 31320012 in words is "thirty-one million, three hundred twenty thousand, twelve".