18669986 has 8 divisors (see below), whose sum is σ = 28277184. Its totient is φ = 9244260.

The previous prime is 18669979. The next prime is 18670007. The reversal of 18669986 is 68996681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45110 + ... + 45521.

It is an arithmetic number, because the mean of its divisors is an integer number (3534648).

Almost surely, 2^18669986 is an apocalyptic number.

18669986 is a deficient number, since it is larger than the sum of its proper divisors (9607198).

18669986 is a wasteful number, since it uses less digits than its factorization.

18669986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90736.

The product of its digits is 1119744, while the sum is 53.

The square root of 18669986 is about 4320.8779200528. The cubic root of 18669986 is about 265.2862031865.

The spelling of 18669986 in words is "eighteen million, six hundred sixty-nine thousand, nine hundred eighty-six".