18089903 has 8 divisors (see below), whose sum is σ = 19603248. Its totient is φ = 16593984.

The previous prime is 18089899. The next prime is 18089909. The reversal of 18089903 is 30998081.

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 18089903 - 2² = 18089899 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18089909) 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, 2150 + ... + 6387.

It is an arithmetic number, because the mean of its divisors is an integer number (2450406).

Almost surely, 2^18089903 is an apocalyptic number.

18089903 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18089903 is a deficient number, since it is larger than the sum of its proper divisors (1513345).

18089903 is a wasteful number, since it uses less digits than its factorization.

18089903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8713.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 18089903 is about 4253.2226605246. Note that the first 3 decimals coincide. The cubic root of 18089903 is about 262.5097344841.

It can be divided in two parts, 1808 and 9903, that added together give a palindrome (11711).

The spelling of 18089903 in words is "eighteen million, eighty-nine thousand, nine hundred three".