18099917 has 16 divisors (see below), whose sum is σ = 21078144. Its totient is φ = 15360000.

The previous prime is 18099869. The next prime is 18099929. The reversal of 18099917 is 71999081.

It is a cyclic number.

It is not a de Polignac number, because 18099917 - 2⁶ = 18099853 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 (18099967) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27917 + ... + 28557.

It is an arithmetic number, because the mean of its divisors is an integer number (1317384).

Almost surely, 2^18099917 is an apocalyptic number.

18099917 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18099917 is a deficient number, since it is larger than the sum of its proper divisors (2978227).

18099917 is a wasteful number, since it uses less digits than its factorization.

18099917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820.

The product of its (nonzero) digits is 40824, while the sum is 44.

The square root of 18099917 is about 4254.3997226401. The cubic root of 18099917 is about 262.5581645864.

The spelling of 18099917 in words is "eighteen million, ninety-nine thousand, nine hundred seventeen".