18099903 has 8 divisors (see below), whose sum is σ = 24198400. Its totient is φ = 12034008.

The previous prime is 18099869. The next prime is 18099929. The reversal of 18099903 is 30999081.

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

It is not a de Polignac number, because 18099903 - 2¹⁰ = 18098879 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 (18099803) 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, 6823 + ... + 9096.

It is an arithmetic number, because the mean of its divisors is an integer number (3024800).

Almost surely, 2^18099903 is an apocalyptic number.

18099903 is a deficient number, since it is larger than the sum of its proper divisors (6098497).

18099903 is a wasteful number, since it uses less digits than its factorization.

18099903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16301.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 18099903 is about 4254.3980772843. The cubic root of 18099903 is about 262.5580968915.

The spelling of 18099903 in words is "eighteen million, ninety-nine thousand, nine hundred three".