18187966 has 16 divisors (see below), whose sum is σ = 28042560. Its totient is φ = 8843040.

The previous prime is 18187937. The next prime is 18187973. The reversal of 18187966 is 66978181.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16480 + ... + 17548.

It is an arithmetic number, because the mean of its divisors is an integer number (1752660).

Almost surely, 2^18187966 is an apocalyptic number.

18187966 is a deficient number, since it is larger than the sum of its proper divisors (9854594).

18187966 is a wasteful number, since it uses less digits than its factorization.

18187966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1299.

The product of its digits is 145152, while the sum is 46.

The square root of 18187966 is about 4264.7351617656. The cubic root of 18187966 is about 262.9832235922.

The spelling of 18187966 in words is "eighteen million, one hundred eighty-seven thousand, nine hundred sixty-six".