17998079 has 4 divisors (see below), whose sum is σ = 19634280. Its totient is φ = 16361880.

The previous prime is 17998069. The next prime is 17998081. The reversal of 17998079 is 97089971.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 17998079 - 2¹⁶ = 17932543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17998069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 818084 + ... + 818105.

It is an arithmetic number, because the mean of its divisors is an integer number (4908570).

Almost surely, 2^17998079 is an apocalyptic number.

17998079 is a deficient number, since it is larger than the sum of its proper divisors (1636201).

17998079 is a wasteful number, since it uses less digits than its factorization.

17998079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1636200.

The product of its (nonzero) digits is 285768, while the sum is 50.

The square root of 17998079 is about 4242.4142890576. The cubic root of 17998079 is about 262.0648160444.

The spelling of 17998079 in words is "seventeen million, nine hundred ninety-eight thousand, seventy-nine".