18999299 has 6 divisors (see below), whose sum is σ = 20883660. Its totient is φ = 17271980.

The previous prime is 18999289. The next prime is 18999313. The reversal of 18999299 is 99299981.

It is not a de Polignac number, because 18999299 - 2⁴ = 18999283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18999209) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 78389 + ... + 78630.

It is an arithmetic number, because the mean of its divisors is an integer number (3480610).

Almost surely, 2^18999299 is an apocalyptic number.

18999299 is a deficient number, since it is larger than the sum of its proper divisors (1884361).

18999299 is a wasteful number, since it uses less digits than its factorization.

18999299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157041 (or 157030 counting only the distinct ones).

The product of its digits is 944784, while the sum is 56.

The square root of 18999299 is about 4358.8185325843. The cubic root of 18999299 is about 266.8368831659.

It can be divided in two parts, 189992 and 99, that added together give a palindrome (190091).

The spelling of 18999299 in words is "eighteen million, nine hundred ninety-nine thousand, two hundred ninety-nine".