18378669 has 8 divisors (see below), whose sum is σ = 24556000. Its totient is φ = 12226896.

The previous prime is 18378637. The next prime is 18378697. The reversal of 18378669 is 96687381.

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

It is not a de Polignac number, because 18378669 - 2⁵ = 18378637 is a prime.

It is a super-2 number, since 2×18378669² = 675550948423122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18378169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4642 + ... + 7635.

It is an arithmetic number, because the mean of its divisors is an integer number (3069500).

Almost surely, 2^18378669 is an apocalyptic number.

It is an amenable number.

18378669 is a deficient number, since it is larger than the sum of its proper divisors (6177331).

18378669 is a wasteful number, since it uses less digits than its factorization.

18378669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12779.

The product of its digits is 435456, while the sum is 48.

The square root of 18378669 is about 4287.0349893604. The cubic root of 18378669 is about 263.8991666115.

The spelling of 18378669 in words is "eighteen million, three hundred seventy-eight thousand, six hundred sixty-nine".