18157158 has 48 divisors (see below), whose sum is σ = 40903200. Its totient is φ = 5816448.

The previous prime is 18157147. The next prime is 18157159. The reversal of 18157158 is 85175181.

It is a happy number.

18157158 is a `hidden beast` number, since 1 + 81 + 571 + 5 + 8 = 666.

It is a super-3 number, since 3×18157158³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 91143 + ... + 91341.

It is an arithmetic number, because the mean of its divisors is an integer number (852150).

Almost surely, 2^18157158 is an apocalyptic number.

18157158 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18157158, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20451600).

18157158 is an abundant number, since it is smaller than the sum of its proper divisors (22746042).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18157158 is a wasteful number, since it uses less digits than its factorization.

18157158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381 (or 378 counting only the distinct ones).

The product of its digits is 11200, while the sum is 36.

The square root of 18157158 is about 4261.1216833130. The cubic root of 18157158 is about 262.8346534511.

The spelling of 18157158 in words is "eighteen million, one hundred fifty-seven thousand, one hundred fifty-eight".