18123834 has 16 divisors (see below), whose sum is σ = 38155680. Its totient is φ = 5723280.

The previous prime is 18123829. The next prime is 18123857. The reversal of 18123834 is 43832181.

It is an alternating number because its digits alternate between odd and even.

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, 79377 + ... + 79604.

It is an arithmetic number, because the mean of its divisors is an integer number (2384730).

Almost surely, 2^18123834 is an apocalyptic number.

18123834 is an abundant number, since it is smaller than the sum of its proper divisors (20031846).

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

18123834 is a wasteful number, since it uses less digits than its factorization.

18123834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159005.

The product of its digits is 4608, while the sum is 30.

The square root of 18123834 is about 4257.2096495240. The cubic root of 18123834 is about 262.6737606915.

The spelling of 18123834 in words is "eighteen million, one hundred twenty-three thousand, eight hundred thirty-four".