18966199 has 16 divisors (see below), whose sum is σ = 23212800. Its totient is φ = 15133824.

The previous prime is 18966197. The next prime is 18966217. The reversal of 18966199 is 99166981.

It is a cyclic number.

It is not a de Polignac number, because 18966199 - 2¹ = 18966197 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 (18966197) 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 15 ways as a sum of consecutive naturals, for example, 6639 + ... + 9055.

It is an arithmetic number, because the mean of its divisors is an integer number (1450800).

Almost surely, 2^18966199 is an apocalyptic number.

18966199 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18966199 is a deficient number, since it is larger than the sum of its proper divisors (4246601).

18966199 is a wasteful number, since it uses less digits than its factorization.

18966199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2502.

The product of its digits is 209952, while the sum is 49.

The square root of 18966199 is about 4355.0199769921. The cubic root of 18966199 is about 266.6818347275.

The spelling of 18966199 in words is "eighteen million, nine hundred sixty-six thousand, one hundred ninety-nine".