18059519 has 4 divisors (see below), whose sum is σ = 19010040. Its totient is φ = 17109000.

The previous prime is 18059513. The next prime is 18059521. The reversal of 18059519 is 91595081.

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 18059519 - 2⁸ = 18059263 is a prime.

It is a super-2 number, since 2×18059519² = 652292453022722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18059513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 475232 + ... + 475269.

It is an arithmetic number, because the mean of its divisors is an integer number (4752510).

Almost surely, 2^18059519 is an apocalyptic number.

18059519 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18059519 is a deficient number, since it is larger than the sum of its proper divisors (950521).

18059519 is an equidigital number, since it uses as much as digits as its factorization.

18059519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 950520.

The product of its (nonzero) digits is 16200, while the sum is 38.

The square root of 18059519 is about 4249.6492796465. The cubic root of 18059519 is about 262.3626807100.

The spelling of 18059519 in words is "eighteen million, fifty-nine thousand, five hundred nineteen".