18700789 has 2 divisors, whose sum is σ = 18700790. Its totient is φ = 18700788.

The previous prime is 18700763. The next prime is 18700793. The reversal of 18700789 is 98700781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13140625 + 5560164 = 3625^2 + 2358^2 .

It is a cyclic number.

It is not a de Polignac number, because 18700789 - 2⁹ = 18700277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18700189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9350394 + 9350395.

It is an arithmetic number, because the mean of its divisors is an integer number (9350395).

Almost surely, 2^18700789 is an apocalyptic number.

It is an amenable number.

18700789 is a deficient number, since it is larger than the sum of its proper divisors (1).

18700789 is an equidigital number, since it uses as much as digits as its factorization.

18700789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28224, while the sum is 40.

The square root of 18700789 is about 4324.4408887161. The cubic root of 18700789 is about 265.4320187039.

The spelling of 18700789 in words is "eighteen million, seven hundred thousand, seven hundred eighty-nine".