18887812 has 12 divisors (see below), whose sum is σ = 33452496. Its totient is φ = 9329960.

The previous prime is 18887809. The next prime is 18887819. The reversal of 18887812 is 21878881.

It is not an unprimeable number, because it can be changed into a prime (18887819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28114 + ... + 28777.

It is an arithmetic number, because the mean of its divisors is an integer number (2787708).

Almost surely, 2^18887812 is an apocalyptic number.

It is an amenable number.

18887812 is a deficient number, since it is larger than the sum of its proper divisors (14564684).

18887812 is a wasteful number, since it uses less digits than its factorization.

18887812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56978 (or 56976 counting only the distinct ones).

The product of its digits is 57344, while the sum is 43.

The square root of 18887812 is about 4346.0110446247. The cubic root of 18887812 is about 266.3139301471.

The spelling of 18887812 in words is "eighteen million, eight hundred eighty-seven thousand, eight hundred twelve".