18519937 has 2 divisors, whose sum is σ = 18519938. Its totient is φ = 18519936.

The previous prime is 18519913. The next prime is 18519959. The reversal of 18519937 is 73991581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18352656 + 167281 = 4284^2 + 409^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18519937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18519893 and 18519902.

It is not a weakly prime, because it can be changed into another prime (18519967) 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, 9259968 + 9259969.

It is an arithmetic number, because the mean of its divisors is an integer number (9259969).

Almost surely, 2^18519937 is an apocalyptic number.

It is an amenable number.

18519937 is a deficient number, since it is larger than the sum of its proper divisors (1).

18519937 is an equidigital number, since it uses as much as digits as its factorization.

18519937 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 43.

The square root of 18519937 is about 4303.4796386180. The cubic root of 18519937 is about 264.5735969192.

The spelling of 18519937 in words is "eighteen million, five hundred nineteen thousand, nine hundred thirty-seven".