18008377 has 2 divisors, whose sum is σ = 18008378. Its totient is φ = 18008376.

The previous prime is 18008363. The next prime is 18008383. The reversal of 18008377 is 77380081.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9834496 + 8173881 = 3136^2 + 2859^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18008377 is a prime.

It is not a weakly prime, because it can be changed into another prime (18008387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9004188 + 9004189.

It is an arithmetic number, because the mean of its divisors is an integer number (9004189).

Almost surely, 2^18008377 is an apocalyptic number.

It is an amenable number.

18008377 is a deficient number, since it is larger than the sum of its proper divisors (1).

18008377 is an equidigital number, since it uses as much as digits as its factorization.

18008377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9408, while the sum is 34.

The square root of 18008377 is about 4243.6278112012. The cubic root of 18008377 is about 262.1147885798.

The spelling of 18008377 in words is "eighteen million, eight thousand, three hundred seventy-seven".