18086417 has 2 divisors, whose sum is σ = 18086418. Its totient is φ = 18086416.

The previous prime is 18086357. The next prime is 18086429. The reversal of 18086417 is 71468081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15555136 + 2531281 = 3944^2 + 1591^2 .

It is an emirp because it is prime and its reverse (71468081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18086417 - 2¹² = 18082321 is a prime.

It is not a weakly prime, because it can be changed into another prime (18086477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9043208 + 9043209.

It is an arithmetic number, because the mean of its divisors is an integer number (9043209).

Almost surely, 2^18086417 is an apocalyptic number.

It is an amenable number.

18086417 is a deficient number, since it is larger than the sum of its proper divisors (1).

18086417 is an equidigital number, since it uses as much as digits as its factorization.

18086417 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 18086417 is about 4252.8128338783. The cubic root of 18086417 is about 262.4928711594.

The spelling of 18086417 in words is "eighteen million, eighty-six thousand, four hundred seventeen".