18180038 has 8 divisors (see below), whose sum is σ = 28874232. Its totient is φ = 8555296.

The previous prime is 18179983. The next prime is 18180059. The reversal of 18180038 is 83008181.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 267320 + ... + 267387.

It is an arithmetic number, because the mean of its divisors is an integer number (3609279).

Almost surely, 2^18180038 is an apocalyptic number.

18180038 is a deficient number, since it is larger than the sum of its proper divisors (10694194).

18180038 is a wasteful number, since it uses less digits than its factorization.

18180038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534726.

The product of its (nonzero) digits is 1536, while the sum is 29.

The square root of 18180038 is about 4263.8055771810. The cubic root of 18180038 is about 262.9450072242.

The spelling of 18180038 in words is "eighteen million, one hundred eighty thousand, thirty-eight".