900000012 has 24 divisors (see below), whose sum is σ = 2131345216. Its totient is φ = 295522128.

The previous prime is 900000011. The next prime is 900000041. The reversal of 900000012 is 210000009.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (900000011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 558898 + ... + 560505.

Almost surely, 2^900000012 is an apocalyptic number.

It is an amenable number.

900000012 is an abundant number, since it is smaller than the sum of its proper divisors (1231345204).

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

900000012 is a wasteful number, since it uses less digits than its factorization.

900000012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1119477 (or 1119475 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 900000012 is about 30000.0002000000. Note that the first 3 decimals coincide. The cubic root of 900000012 is about 965.4893888967.

Subtracting from 900000012 its sum of digits (12), we obtain a square (900000000 = 30000²).

The spelling of 900000012 in words is "nine hundred million, twelve", and thus it is an aban number.