18038899 has 8 divisors (see below), whose sum is σ = 18925920. Its totient is φ = 17169600.

The previous prime is 18038897. The next prime is 18038947. The reversal of 18038899 is 99883081.

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

It is a cyclic number.

It is not a de Polignac number, because 18038899 - 2¹ = 18038897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18038897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2322 + ... + 6439.

It is an arithmetic number, because the mean of its divisors is an integer number (2365740).

Almost surely, 2^18038899 is an apocalyptic number.

18038899 is a deficient number, since it is larger than the sum of its proper divisors (887021).

18038899 is an equidigital number, since it uses as much as digits as its factorization.

18038899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8861.

The product of its (nonzero) digits is 124416, while the sum is 46.

The square root of 18038899 is about 4247.2225041785. Note that the first 3 decimals coincide. The cubic root of 18038899 is about 262.2627891835.

The spelling of 18038899 in words is "eighteen million, thirty-eight thousand, eight hundred ninety-nine".