18085155 has 32 divisors (see below), whose sum is σ = 32313600. Its totient is φ = 8561280.

The previous prime is 18085147. The next prime is 18085163. The reversal of 18085155 is 55158081.

It is an interprime number because it is at equal distance from previous prime (18085147) and next prime (18085163).

It is not a de Polignac number, because 18085155 - 2³ = 18085147 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

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 31 ways as a sum of consecutive naturals, for example, 5821 + ... + 8369.

It is an arithmetic number, because the mean of its divisors is an integer number (1009800).

Almost surely, 2^18085155 is an apocalyptic number.

18085155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18085155 is a deficient number, since it is larger than the sum of its proper divisors (14228445).

18085155 is a wasteful number, since it uses less digits than its factorization.

18085155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2611.

The product of its (nonzero) digits is 8000, while the sum is 33.

The square root of 18085155 is about 4252.6644589010. The cubic root of 18085155 is about 262.4867657727.

The spelling of 18085155 in words is "eighteen million, eighty-five thousand, one hundred fifty-five".