18913899 has 8 divisors (see below), whose sum is σ = 25595200. Its totient is φ = 12420936.

The previous prime is 18913891. The next prime is 18913907. The reversal of 18913899 is 99831981.

It is an interprime number because it is at equal distance from previous prime (18913891) and next prime (18913907).

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

It is not a de Polignac number, because 18913899 - 2³ = 18913891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18913891) 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, 46849 + ... + 47250.

It is an arithmetic number, because the mean of its divisors is an integer number (3199400).

Almost surely, 2^18913899 is an apocalyptic number.

18913899 is a deficient number, since it is larger than the sum of its proper divisors (6681301).

18913899 is an equidigital number, since it uses as much as digits as its factorization.

18913899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94169.

The product of its digits is 139968, while the sum is 48.

The square root of 18913899 is about 4349.0112669433. The cubic root of 18913899 is about 266.4364807015.

The spelling of 18913899 in words is "eighteen million, nine hundred thirteen thousand, eight hundred ninety-nine".