18115955 has 24 divisors (see below), whose sum is σ = 25693200. Its totient is φ = 12155520.

The previous prime is 18115939. The next prime is 18115967. The reversal of 18115955 is 55951181.

It is not a de Polignac number, because 18115955 - 2⁴ = 18115939 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 8321 + ... + 10269.

It is an arithmetic number, because the mean of its divisors is an integer number (1070550).

Almost surely, 2^18115955 is an apocalyptic number.

18115955 is a deficient number, since it is larger than the sum of its proper divisors (7577245).

18115955 is a wasteful number, since it uses less digits than its factorization.

18115955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1991 (or 1978 counting only the distinct ones).

The product of its digits is 9000, while the sum is 35.

The square root of 18115955 is about 4256.2841775427. The cubic root of 18115955 is about 262.6356909957.

The spelling of 18115955 in words is "eighteen million, one hundred fifteen thousand, nine hundred fifty-five".