18157955 has 8 divisors (see below), whose sum is σ = 23071392. Its totient is φ = 13671808.

The previous prime is 18157949. The next prime is 18157961. The reversal of 18157955 is 55975181.

It is an interprime number because it is at equal distance from previous prime (18157949) and next prime (18157961).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18157955 - 2⁶ = 18157891 is a prime.

It is a super-2 number, since 2×18157955² = 659422659564050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106727 + ... + 106896.

It is an arithmetic number, because the mean of its divisors is an integer number (2883924).

Almost surely, 2^18157955 is an apocalyptic number.

18157955 is a deficient number, since it is larger than the sum of its proper divisors (4913437).

18157955 is a wasteful number, since it uses less digits than its factorization.

18157955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213645.

The product of its digits is 63000, while the sum is 41.

The square root of 18157955 is about 4261.2152022633. The cubic root of 18157955 is about 262.8384990631.

The spelling of 18157955 in words is "eighteen million, one hundred fifty-seven thousand, nine hundred fifty-five".