18874859 has 2 divisors, whose sum is σ = 18874860. Its totient is φ = 18874858.

The previous prime is 18874831. The next prime is 18874897. The reversal of 18874859 is 95847881.

It is a weak prime.

It is an emirp because it is prime and its reverse (95847881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18874859 - 2²⁰ = 17826283 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18874459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9437429 + 9437430.

It is an arithmetic number, because the mean of its divisors is an integer number (9437430).

Almost surely, 2^18874859 is an apocalyptic number.

18874859 is a deficient number, since it is larger than the sum of its proper divisors (1).

18874859 is an equidigital number, since it uses as much as digits as its factorization.

18874859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 645120, while the sum is 50.

The square root of 18874859 is about 4344.5205719389. The cubic root of 18874859 is about 266.2530380898.

The spelling of 18874859 in words is "eighteen million, eight hundred seventy-four thousand, eight hundred fifty-nine".