18909199 has 8 divisors (see below), whose sum is σ = 19949040. Its totient is φ = 17873856.

The previous prime is 18909173. The next prime is 18909221. The reversal of 18909199 is 99190981.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18909199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18909139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10917 + ... + 12529.

It is an arithmetic number, because the mean of its divisors is an integer number (2493630).

Almost surely, 2^18909199 is an apocalyptic number.

18909199 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18909199 is a deficient number, since it is larger than the sum of its proper divisors (1039841).

18909199 is a wasteful number, since it uses less digits than its factorization.

18909199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2249.

The product of its (nonzero) digits is 52488, while the sum is 46.

The square root of 18909199 is about 4348.4708806660. The cubic root of 18909199 is about 266.4144095393.

The spelling of 18909199 in words is "eighteen million, nine hundred nine thousand, one hundred ninety-nine".