18099869 has 2 divisors, whose sum is σ = 18099870. Its totient is φ = 18099868.

The previous prime is 18099853. The next prime is 18099929. The reversal of 18099869 is 96899081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17724100 + 375769 = 4210^2 + 613^2 .

It is a cyclic number.

It is not a de Polignac number, because 18099869 - 2⁴ = 18099853 is a prime.

It is a super-2 number, since 2×18099869² = 655210515634322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18099269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9049934 + 9049935.

It is an arithmetic number, because the mean of its divisors is an integer number (9049935).

Almost surely, 2^18099869 is an apocalyptic number.

It is an amenable number.

18099869 is a deficient number, since it is larger than the sum of its proper divisors (1).

18099869 is an equidigital number, since it uses as much as digits as its factorization.

18099869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 50.

The square root of 18099869 is about 4254.3940814175. The cubic root of 18099869 is about 262.5579324895.

The spelling of 18099869 in words is "eighteen million, ninety-nine thousand, eight hundred sixty-nine".