18855937 has 2 divisors, whose sum is σ = 18855938. Its totient is φ = 18855936.

The previous prime is 18855931. The next prime is 18855953. The reversal of 18855937 is 73955881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10784656 + 8071281 = 3284^2 + 2841^2 .

It is an emirp because it is prime and its reverse (73955881) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18855937 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18855931) 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, 9427968 + 9427969.

It is an arithmetic number, because the mean of its divisors is an integer number (9427969).

Almost surely, 2^18855937 is an apocalyptic number.

It is an amenable number.

18855937 is a deficient number, since it is larger than the sum of its proper divisors (1).

18855937 is an equidigital number, since it uses as much as digits as its factorization.

18855937 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 302400, while the sum is 46.

The square root of 18855937 is about 4342.3423402583. The cubic root of 18855937 is about 266.1640356683.

The spelling of 18855937 in words is "eighteen million, eight hundred fifty-five thousand, nine hundred thirty-seven".