18088249 has 4 divisors (see below), whose sum is σ = 18248436. Its totient is φ = 17928064.

The previous prime is 18088219. The next prime is 18088253. The reversal of 18088249 is 94288081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94288081 = 31 ⋅3041551.

It can be written as a sum of positive squares in 2 ways, for example, as 3404025 + 14684224 = 1845^2 + 3832^2 .

It is a cyclic number.

It is not a de Polignac number, because 18088249 - 2⁷ = 18088121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18088219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79924 + ... + 80149.

It is an arithmetic number, because the mean of its divisors is an integer number (4562109).

Almost surely, 2^18088249 is an apocalyptic number.

It is an amenable number.

18088249 is a deficient number, since it is larger than the sum of its proper divisors (160187).

18088249 is a wasteful number, since it uses less digits than its factorization.

18088249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160186.

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 18088249 is about 4253.0282152838. The cubic root of 18088249 is about 262.5017336242.

The spelling of 18088249 in words is "eighteen million, eighty-eight thousand, two hundred forty-nine".