18390115 has 4 divisors (see below), whose sum is σ = 22068144. Its totient is φ = 14712088.

The previous prime is 18390103. The next prime is 18390131. The reversal of 18390115 is 51109381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51109381 = 23 ⋅2222147.

It is a cyclic number.

It is not a de Polignac number, because 18390115 - 2⁵ = 18390083 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1839007 + ... + 1839016.

It is an arithmetic number, because the mean of its divisors is an integer number (5517036).

Almost surely, 2^18390115 is an apocalyptic number.

18390115 is a deficient number, since it is larger than the sum of its proper divisors (3678029).

18390115 is an equidigital number, since it uses as much as digits as its factorization.

18390115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3678028.

The product of its (nonzero) digits is 1080, while the sum is 28.

The square root of 18390115 is about 4288.3697368581. The cubic root of 18390115 is about 263.9539395844.

Adding to 18390115 its reverse (51109381), we get a palindrome (69499496).

The spelling of 18390115 in words is "eighteen million, three hundred ninety thousand, one hundred fifteen".