18998669 has 8 divisors (see below), whose sum is σ = 19538688. Its totient is φ = 18464400.

The previous prime is 18998657. The next prime is 18998699. The reversal of 18998669 is 96689981.

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 18998669 - 2¹⁶ = 18933133 is a prime.

It is a super-2 number, since 2×18998669² = 721898847543122, 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 (18998699) 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, 5759 + ... + 8435.

It is an arithmetic number, because the mean of its divisors is an integer number (2442336).

Almost surely, 2^18998669 is an apocalyptic number.

It is an amenable number.

18998669 is a deficient number, since it is larger than the sum of its proper divisors (540019).

18998669 is a wasteful number, since it uses less digits than its factorization.

18998669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2875.

The product of its digits is 1679616, while the sum is 56.

The square root of 18998669 is about 4358.7462646958. The cubic root of 18998669 is about 266.8339337748.

The spelling of 18998669 in words is "eighteen million, nine hundred ninety-eight thousand, six hundred sixty-nine".