18138234 has 8 divisors (see below), whose sum is σ = 36276480. Its totient is φ = 6046076.

The previous prime is 18138229. The next prime is 18138247. The reversal of 18138234 is 43283181.

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

18138234 is an admirable number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1511514 + ... + 1511525.

It is an arithmetic number, because the mean of its divisors is an integer number (4534560).

Almost surely, 2^18138234 is an apocalyptic number.

18138234 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18138234 is a wasteful number, since it uses less digits than its factorization.

18138234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3023044.

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

The square root of 18138234 is about 4258.9005623517. The cubic root of 18138234 is about 262.7433100083.

The spelling of 18138234 in words is "eighteen million, one hundred thirty-eight thousand, two hundred thirty-four".