18839420903 has 2 divisors, whose sum is σ = 18839420904. Its totient is φ = 18839420902.

The previous prime is 18839420891. The next prime is 18839420953. The reversal of 18839420903 is 30902493881.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18839420903 - 2²⁰ = 18838372327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18839420953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9419710451 + 9419710452.

It is an arithmetic number, because the mean of its divisors is an integer number (9419710452).

Almost surely, 2^18839420903 is an apocalyptic number.

18839420903 is a deficient number, since it is larger than the sum of its proper divisors (1).

18839420903 is an equidigital number, since it uses as much as digits as its factorization.

18839420903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 47.

The spelling of 18839420903 in words is "eighteen billion, eight hundred thirty-nine million, four hundred twenty thousand, nine hundred three".