18998967 has 16 divisors (see below), whose sum is σ = 27359360. Its totient is φ = 11657952.

The previous prime is 18998957. The next prime is 18998977. The reversal of 18998967 is 76989981.

It is an interprime number because it is at equal distance from previous prime (18998957) and next prime (18998977).

It is not a de Polignac number, because 18998967 - 2⁷ = 18998839 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 (18998957) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23748 + ... + 24534.

It is an arithmetic number, because the mean of its divisors is an integer number (1709960).

Almost surely, 2^18998967 is an apocalyptic number.

18998967 is a deficient number, since it is larger than the sum of its proper divisors (8360393).

18998967 is a wasteful number, since it uses less digits than its factorization.

18998967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1422.

The product of its digits is 1959552, while the sum is 57.

The square root of 18998967 is about 4358.7804487035. The cubic root of 18998967 is about 266.8353288917.

The spelling of 18998967 in words is "eighteen million, nine hundred ninety-eight thousand, nine hundred sixty-seven".