18140009 has 2 divisors, whose sum is σ = 18140010. Its totient is φ = 18140008.

The previous prime is 18139987. The next prime is 18140011. The reversal of 18140009 is 90004181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17977600 + 162409 = 4240^2 + 403^2 .

It is a cyclic number.

It is not a de Polignac number, because 18140009 - 2²⁰ = 17091433 is a prime.

It is a Sophie Germain prime.

Together with 18140011, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18140609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9070004 + 9070005.

It is an arithmetic number, because the mean of its divisors is an integer number (9070005).

Almost surely, 2^18140009 is an apocalyptic number.

It is an amenable number.

18140009 is a deficient number, since it is larger than the sum of its proper divisors (1).

18140009 is an equidigital number, since it uses as much as digits as its factorization.

18140009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 18140009 is about 4259.1089443685. The cubic root of 18140009 is about 262.7518803790.

The spelling of 18140009 in words is "eighteen million, one hundred forty thousand, nine".