18768859 has 2 divisors, whose sum is σ = 18768860. Its totient is φ = 18768858.

The previous prime is 18768817. The next prime is 18768917. The reversal of 18768859 is 95886781.

It is a weak prime.

It is an emirp because it is prime and its reverse (95886781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18768859 - 2¹³ = 18760667 is a prime.

It is not a weakly prime, because it can be changed into another prime (18768809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9384429 + 9384430.

It is an arithmetic number, because the mean of its divisors is an integer number (9384430).

Almost surely, 2^18768859 is an apocalyptic number.

18768859 is a deficient number, since it is larger than the sum of its proper divisors (1).

18768859 is an equidigital number, since it uses as much as digits as its factorization.

18768859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 967680, while the sum is 52.

The square root of 18768859 is about 4332.3041213654. The cubic root of 18768859 is about 265.7536821296.

The spelling of 18768859 in words is "eighteen million, seven hundred sixty-eight thousand, eight hundred fifty-nine".