18104989 has 8 divisors (see below), whose sum is σ = 20730368. Its totient is φ = 15489360.

The previous prime is 18104987. The next prime is 18105007. The reversal of 18104989 is 98940181.

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 18104989 - 2¹ = 18104987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18104987) 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, 2119 + ... + 6379.

It is an arithmetic number, because the mean of its divisors is an integer number (2591296).

Almost surely, 2^18104989 is an apocalyptic number.

It is an amenable number.

18104989 is a deficient number, since it is larger than the sum of its proper divisors (2625379).

18104989 is an equidigital number, since it uses as much as digits as its factorization.

18104989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4875.

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 18104989 is about 4254.9957696806. The cubic root of 18104989 is about 262.5826871784.

The spelling of 18104989 in words is "eighteen million, one hundred four thousand, nine hundred eighty-nine".