18998667 has 12 divisors (see below), whose sum is σ = 28635984. Its totient is φ = 12114960.

The previous prime is 18998657. The next prime is 18998699. The reversal of 18998667 is 76689981.

It is not a de Polignac number, because 18998667 - 2⁸ = 18998411 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18998657) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45684 + ... + 46097.

It is an arithmetic number, because the mean of its divisors is an integer number (2386332).

Almost surely, 2^18998667 is an apocalyptic number.

18998667 is a deficient number, since it is larger than the sum of its proper divisors (9637317).

18998667 is a wasteful number, since it uses less digits than its factorization.

18998667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91810 (or 91807 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 18998667 is about 4358.7460352721. The cubic root of 18998667 is about 266.8339244115.

The spelling of 18998667 in words is "eighteen million, nine hundred ninety-eight thousand, six hundred sixty-seven".