18944899 has 4 divisors (see below), whose sum is σ = 19041264. Its totient is φ = 18848536.

The previous prime is 18944867. The next prime is 18944909. The reversal of 18944899 is 99844981.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18944899 - 2⁵ = 18944867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18944839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47887 + ... + 48280.

It is an arithmetic number, because the mean of its divisors is an integer number (4760316).

Almost surely, 2^18944899 is an apocalyptic number.

18944899 is a deficient number, since it is larger than the sum of its proper divisors (96365).

18944899 is an equidigital number, since it uses as much as digits as its factorization.

18944899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96364.

The product of its digits is 746496, while the sum is 52.

The square root of 18944899 is about 4352.5738362491. The cubic root of 18944899 is about 266.5819649392.

The spelling of 18944899 in words is "eighteen million, nine hundred forty-four thousand, eight hundred ninety-nine".