18457998 has 16 divisors (see below), whose sum is σ = 39755856. Its totient is φ = 5679360.

The previous prime is 18457991. The next prime is 18458023. The reversal of 18457998 is 89975481.

It is a self number, because there is not a number n which added to its sum of digits gives 18457998.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18457991) 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, 118243 + ... + 118398.

It is an arithmetic number, because the mean of its divisors is an integer number (2484741).

Almost surely, 2^18457998 is an apocalyptic number.

18457998 is an abundant number, since it is smaller than the sum of its proper divisors (21297858).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18457998 is a wasteful number, since it uses less digits than its factorization.

18457998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236659.

The product of its digits is 725760, while the sum is 51.

The square root of 18457998 is about 4296.2772256920. The cubic root of 18457998 is about 264.2783164509.

The spelling of 18457998 in words is "eighteen million, four hundred fifty-seven thousand, nine hundred ninety-eight".