18088409 has 2 divisors, whose sum is σ = 18088410. Its totient is φ = 18088408.

The previous prime is 18088403. The next prime is 18088429. The reversal of 18088409 is 90488081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18088009 + 400 = 4253^2 + 20^2 .

It is a cyclic number.

It is not a de Polignac number, because 18088409 - 2²⁰ = 17039833 is a prime.

It is not a weakly prime, because it can be changed into another prime (18088403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9044204 + 9044205.

It is an arithmetic number, because the mean of its divisors is an integer number (9044205).

Almost surely, 2^18088409 is an apocalyptic number.

It is an amenable number.

18088409 is a deficient number, since it is larger than the sum of its proper divisors (1).

18088409 is an equidigital number, since it uses as much as digits as its factorization.

18088409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 18088409 is about 4253.0470253690. The cubic root of 18088409 is about 262.5025076102.

The spelling of 18088409 in words is "eighteen million, eighty-eight thousand, four hundred nine".