18008777 has 2 divisors, whose sum is σ = 18008778. Its totient is φ = 18008776.

The previous prime is 18008693. The next prime is 18008801. The reversal of 18008777 is 77780081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13424896 + 4583881 = 3664^2 + 2141^2 .

It is an emirp because it is prime and its reverse (77780081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18008777 - 2¹⁴ = 17992393 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18008777.

It is not a weakly prime, because it can be changed into another prime (18008377) 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, 9004388 + 9004389.

It is an arithmetic number, because the mean of its divisors is an integer number (9004389).

Almost surely, 2^18008777 is an apocalyptic number.

It is an amenable number.

18008777 is a deficient number, since it is larger than the sum of its proper divisors (1).

18008777 is an equidigital number, since it uses as much as digits as its factorization.

18008777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21952, while the sum is 38.

The square root of 18008777 is about 4243.6749404260. The cubic root of 18008777 is about 262.1167292533.

The spelling of 18008777 in words is "eighteen million, eight thousand, seven hundred seventy-seven".