31812012 has 18 divisors (see below), whose sum is σ = 80413788. Its totient is φ = 10603992.

The previous prime is 31811999. The next prime is 31812019. The reversal of 31812012 is 21021813.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (31812019) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 441798 + ... + 441869.

Almost surely, 2^31812012 is an apocalyptic number.

It is an amenable number.

31812012 is an abundant number, since it is smaller than the sum of its proper divisors (48601776).

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

31812012 is a wasteful number, since it uses less digits than its factorization.

31812012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883677 (or 883672 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 31812012 is about 5640.2138257339. The cubic root of 31812012 is about 316.8572966079.

Adding to 31812012 its reverse (21021813), we get a palindrome (52833825).

The spelling of 31812012 in words is "thirty-one million, eight hundred twelve thousand, twelve".