18613903 has 8 divisors (see below), whose sum is σ = 23207040. Its totient is φ = 14504280.

The previous prime is 18613897. The next prime is 18613913. The reversal of 18613903 is 30931681.

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

It is not a de Polignac number, because 18613903 - 2⁵ = 18613871 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 (18613913) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 120793 + ... + 120946.

It is an arithmetic number, because the mean of its divisors is an integer number (2900880).

Almost surely, 2^18613903 is an apocalyptic number.

18613903 is a deficient number, since it is larger than the sum of its proper divisors (4593137).

18613903 is a wasteful number, since it uses less digits than its factorization.

18613903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241757.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 18613903 is about 4314.3832699472. The cubic root of 18613903 is about 265.0203046030.

The spelling of 18613903 in words is "eighteen million, six hundred thirteen thousand, nine hundred three".