18535819 has 2 divisors, whose sum is σ = 18535820. Its totient is φ = 18535818.

The previous prime is 18535807. The next prime is 18535837. The reversal of 18535819 is 91853581.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18535819 - 2⁵ = 18535787 is a prime.

It is a super-2 number, since 2×18535819² = 687153172001522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18535859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9267909 + 9267910.

It is an arithmetic number, because the mean of its divisors is an integer number (9267910).

Almost surely, 2^18535819 is an apocalyptic number.

18535819 is a deficient number, since it is larger than the sum of its proper divisors (1).

18535819 is an equidigital number, since it uses as much as digits as its factorization.

18535819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43200, while the sum is 40.

The square root of 18535819 is about 4305.3244941584. The cubic root of 18535819 is about 264.6492047591.

The spelling of 18535819 in words is "eighteen million, five hundred thirty-five thousand, eight hundred nineteen".