18093815 has 12 divisors (see below), whose sum is σ = 21993384. Its totient is φ = 14289696.

The previous prime is 18093799. The next prime is 18093821. The reversal of 18093815 is 51839081.

It is not a de Polignac number, because 18093815 - 2⁴ = 18093799 is a prime.

It is a super-2 number, since 2×18093815² = 654772282508450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 110924 + ... + 111086.

It is an arithmetic number, because the mean of its divisors is an integer number (1832782).

Almost surely, 2^18093815 is an apocalyptic number.

18093815 is a deficient number, since it is larger than the sum of its proper divisors (3899569).

18093815 is an equidigital number, since it uses as much as digits as its factorization.

18093815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466 (or 317 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 18093815 is about 4253.6825222388. The cubic root of 18093815 is about 262.5286559797.

The spelling of 18093815 in words is "eighteen million, ninety-three thousand, eight hundred fifteen".