18369985 has 8 divisors (see below), whose sum is σ = 23002560. Its totient is φ = 14056944.

The previous prime is 18369973. The next prime is 18369991. The reversal of 18369985 is 58996381.

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

It is a cyclic number.

It is not a de Polignac number, because 18369985 - 2²¹ = 16272833 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79755 + ... + 79984.

It is an arithmetic number, because the mean of its divisors is an integer number (2875320).

Almost surely, 2^18369985 is an apocalyptic number.

It is an amenable number.

18369985 is a deficient number, since it is larger than the sum of its proper divisors (4632575).

18369985 is a wasteful number, since it uses less digits than its factorization.

18369985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159767.

The product of its digits is 466560, while the sum is 49.

The square root of 18369985 is about 4286.0220484734. The cubic root of 18369985 is about 263.8575955669.

The spelling of 18369985 in words is "eighteen million, three hundred sixty-nine thousand, nine hundred eighty-five".