18910199 has 8 divisors (see below), whose sum is σ = 23576448. Its totient is φ = 14735160.

The previous prime is 18910181. The next prime is 18910207. The reversal of 18910199 is 99101981.

It is a happy number.

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

It is not a de Polignac number, because 18910199 - 2¹⁶ = 18844663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18910169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122717 + ... + 122870.

It is an arithmetic number, because the mean of its divisors is an integer number (2947056).

Almost surely, 2^18910199 is an apocalyptic number.

18910199 is a deficient number, since it is larger than the sum of its proper divisors (4666249).

18910199 is a wasteful number, since it uses less digits than its factorization.

18910199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245605.

The product of its (nonzero) digits is 5832, while the sum is 38.

The square root of 18910199 is about 4348.5858620936. The cubic root of 18910199 is about 266.4191058375.

The spelling of 18910199 in words is "eighteen million, nine hundred ten thousand, one hundred ninety-nine".