18158000 has 80 divisors (see below), whose sum is σ = 50217024. Its totient is φ = 6220800.

The previous prime is 18157999. The next prime is 18158011. The reversal of 18158000 is 85181.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13352 + ... + 14648.

Almost surely, 2^18158000 is an apocalyptic number.

18158000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18158000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25108512).

18158000 is an abundant number, since it is smaller than the sum of its proper divisors (32059024).

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

18158000 is a wasteful number, since it uses less digits than its factorization.

18158000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1327 (or 1311 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 23.

The square root of 18158000 is about 4261.2204824440. The cubic root of 18158000 is about 262.8387161896.

The spelling of 18158000 in words is "eighteen million, one hundred fifty-eight thousand".