18998345 has 8 divisors (see below), whose sum is σ = 23789376. Its totient is φ = 14537776.

The previous prime is 18998321. The next prime is 18998359. The reversal of 18998345 is 54389981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18998345 - 2⁶ = 18998281 is a prime.

It is a super-2 number, since 2×18998345² = 721874225478050, which contains 22 as substring.

It is a Duffinian number.

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 18998345.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82487 + ... + 82716.

It is an arithmetic number, because the mean of its divisors is an integer number (2973672).

Almost surely, 2^18998345 is an apocalyptic number.

It is an amenable number.

18998345 is a deficient number, since it is larger than the sum of its proper divisors (4791031).

18998345 is a wasteful number, since it uses less digits than its factorization.

18998345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165231.

The product of its digits is 311040, while the sum is 47.

The square root of 18998345 is about 4358.7090978867. The cubic root of 18998345 is about 266.8324169196.

The spelling of 18998345 in words is "eighteen million, nine hundred ninety-eight thousand, three hundred forty-five".