18879199 has 2 divisors, whose sum is σ = 18879200. Its totient is φ = 18879198.

The previous prime is 18879181. The next prime is 18879209. The reversal of 18879199 is 99197881.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18879199 - 2⁷ = 18879071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18879109) 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 as a sum of consecutive naturals, namely, 9439599 + 9439600.

It is an arithmetic number, because the mean of its divisors is an integer number (9439600).

Almost surely, 2^18879199 is an apocalyptic number.

18879199 is a deficient number, since it is larger than the sum of its proper divisors (1).

18879199 is an equidigital number, since it uses as much as digits as its factorization.

18879199 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 52.

The square root of 18879199 is about 4345.0200229688. The cubic root of 18879199 is about 266.2734435337.

The spelling of 18879199 in words is "eighteen million, eight hundred seventy-nine thousand, one hundred ninety-nine".