18998427 has 32 divisors (see below), whose sum is σ = 30400000. Its totient is φ = 10541664.

The previous prime is 18998411. The next prime is 18998471. The reversal of 18998427 is 72489981.

It is not a de Polignac number, because 18998427 - 2⁴ = 18998411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18998477) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37824 + ... + 38322.

It is an arithmetic number, because the mean of its divisors is an integer number (950000).

Almost surely, 2^18998427 is an apocalyptic number.

18998427 is a deficient number, since it is larger than the sum of its proper divisors (11401573).

18998427 is an equidigital number, since it uses as much as digits as its factorization.

18998427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560 (or 546 counting only the distinct ones).

The product of its digits is 290304, while the sum is 48.

The square root of 18998427 is about 4358.7185043313. The cubic root of 18998427 is about 266.8328008167.

The spelling of 18998427 in words is "eighteen million, nine hundred ninety-eight thousand, four hundred twenty-seven".