18947012 has 12 divisors (see below), whose sum is σ = 37894080. Its totient is φ = 8120136.

The previous prime is 18946999. The next prime is 18947017. The reversal of 18947012 is 21074981.

18947012 is an admirable number.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 18947012.

It is not an unprimeable number, because it can be changed into a prime (18947017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 338312 + ... + 338367.

It is an arithmetic number, because the mean of its divisors is an integer number (3157840).

Almost surely, 2^18947012 is an apocalyptic number.

It is an amenable number.

18947012 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18947012 is a wasteful number, since it uses less digits than its factorization.

18947012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676690 (or 676688 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 18947012 is about 4352.8165594245. The cubic root of 18947012 is about 266.5918755533.

The spelling of 18947012 in words is "eighteen million, nine hundred forty-seven thousand, twelve".