18157155 has 8 divisors (see below), whose sum is σ = 29051472. Its totient is φ = 9683808.

The previous prime is 18157147. The next prime is 18157159. The reversal of 18157155 is 55175181.

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

It is not a de Polignac number, because 18157155 - 2³ = 18157147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18157159) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 605224 + ... + 605253.

It is an arithmetic number, because the mean of its divisors is an integer number (3631434).

Almost surely, 2^18157155 is an apocalyptic number.

18157155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18157155 is a deficient number, since it is larger than the sum of its proper divisors (10894317).

18157155 is a wasteful number, since it uses less digits than its factorization.

18157155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1210485.

The product of its digits is 7000, while the sum is 33.

The square root of 18157155 is about 4261.1213312930. The cubic root of 18157155 is about 262.8346389755.

The spelling of 18157155 in words is "eighteen million, one hundred fifty-seven thousand, one hundred fifty-five".