18088009 has 3 divisors (see below), whose sum is σ = 18092263. Its totient is φ = 18083756.

The previous prime is 18087991. The next prime is 18088027. The reversal of 18088009 is 90088081.

The square root of 18088009 is 4253.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 90088081 = 37 ⋅2434813.

It is an interprime number because it is at equal distance from previous prime (18087991) and next prime (18088027).

It can be written as a sum of positive squares in only one way, i.e., 1863225 + 16224784 = 1365^2 + 4028^2 .

It is not a de Polignac number, because 18088009 - 2⁵ = 18087977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18088039) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2127 + ... + 6379.

Almost surely, 2^18088009 is an apocalyptic number.

18088009 is the 4253-rd square number.

18088009 is the 2127-th centered octagonal number.

It is an amenable number.

18088009 is a deficient number, since it is larger than the sum of its proper divisors (4254).

18088009 is an frugal number, since it uses more digits than its factorization.

18088009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8506 (or 4253 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 34.

The cubic root of 18088009 is about 262.5005726367.

The spelling of 18088009 in words is "eighteen million, eighty-eight thousand, nine".