18087417 has 6 divisors (see below), whose sum is σ = 26126282. Its totient is φ = 12058272.

The previous prime is 18087401. The next prime is 18087457. The reversal of 18087417 is 71478081.

It can be written as a sum of positive squares in only one way, i.e., 15492096 + 2595321 = 3936^2 + 1611^2 .

It is not a de Polignac number, because 18087417 - 2⁴ = 18087401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18087457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1004848 + ... + 1004865.

Almost surely, 2^18087417 is an apocalyptic number.

It is an amenable number.

18087417 is a deficient number, since it is larger than the sum of its proper divisors (8038865).

18087417 is a wasteful number, since it uses less digits than its factorization.

18087417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2009719 (or 2009716 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 36.

The square root of 18087417 is about 4252.9304014997. The cubic root of 18087417 is about 262.4977088235.

The spelling of 18087417 in words is "eighteen million, eighty-seven thousand, four hundred seventeen".