18998073 has 12 divisors (see below), whose sum is σ = 27542320. Its totient is φ = 12618936.

The previous prime is 18998053. The next prime is 18998093. The reversal of 18998073 is 37089981.

It is an interprime number because it is at equal distance from previous prime (18998053) and next prime (18998093).

It is not a de Polignac number, because 18998073 - 2⁸ = 18997817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18998033) 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, 1183 + ... + 6276.

Almost surely, 2^18998073 is an apocalyptic number.

It is an amenable number.

18998073 is a deficient number, since it is larger than the sum of its proper divisors (8544247).

18998073 is a wasteful number, since it uses less digits than its factorization.

18998073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7748 (or 7745 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 18998073 is about 4358.6778958762. The cubic root of 18998073 is about 266.8311434971.

The spelling of 18998073 in words is "eighteen million, nine hundred ninety-eight thousand, seventy-three".