18318519 has 6 divisors (see below), whose sum is σ = 26460096. Its totient is φ = 12212340.

The previous prime is 18318499. The next prime is 18318523. The reversal of 18318519 is 91581381.

It is not a de Polignac number, because 18318519 - 2⁹ = 18318007 is a prime.

It is a super-3 number, since 3×18318519³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18318529) 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 5 ways as a sum of consecutive naturals, for example, 1017687 + ... + 1017704.

It is an arithmetic number, because the mean of its divisors is an integer number (4410016).

Almost surely, 2^18318519 is an apocalyptic number.

18318519 is a deficient number, since it is larger than the sum of its proper divisors (8141577).

18318519 is a wasteful number, since it uses less digits than its factorization.

18318519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2035397 (or 2035394 counting only the distinct ones).

The product of its digits is 8640, while the sum is 36.

The square root of 18318519 is about 4280.0139018466. The cubic root of 18318519 is about 263.6109541648.

The spelling of 18318519 in words is "eighteen million, three hundred eighteen thousand, five hundred nineteen".