18997458 has 16 divisors (see below), whose sum is σ = 38045376. Its totient is φ = 6324080.

The previous prime is 18997453. The next prime is 18997481. The reversal of 18997458 is 85479981.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18997458.

It is not an unprimeable number, because it can be changed into a prime (18997453) 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, 4288 + ... + 7508.

It is an arithmetic number, because the mean of its divisors is an integer number (2377836).

Almost surely, 2^18997458 is an apocalyptic number.

18997458 is an abundant number, since it is smaller than the sum of its proper divisors (19047918).

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

18997458 is a wasteful number, since it uses less digits than its factorization.

18997458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4209.

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

The square root of 18997458 is about 4358.6073463894. The cubic root of 18997458 is about 266.8282642064.

The spelling of 18997458 in words is "eighteen million, nine hundred ninety-seven thousand, four hundred fifty-eight".