18085997 has 2 divisors, whose sum is σ = 18085998. Its totient is φ = 18085996.

The previous prime is 18085993. The next prime is 18086009. The reversal of 18085997 is 79958081.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12823561 + 5262436 = 3581^2 + 2294^2 .

It is a cyclic number.

It is not a de Polignac number, because 18085997 - 2² = 18085993 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18085993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9042998 + 9042999.

It is an arithmetic number, because the mean of its divisors is an integer number (9042999).

Almost surely, 2^18085997 is an apocalyptic number.

It is an amenable number.

18085997 is a deficient number, since it is larger than the sum of its proper divisors (1).

18085997 is an equidigital number, since it uses as much as digits as its factorization.

18085997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 47.

The square root of 18085997 is about 4252.7634545081. The cubic root of 18085997 is about 262.4908392873.

The spelling of 18085997 in words is "eighteen million, eighty-five thousand, nine hundred ninety-seven".