18736819 has 2 divisors, whose sum is σ = 18736820. Its totient is φ = 18736818.

The previous prime is 18736787. The next prime is 18736841. The reversal of 18736819 is 91863781.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18736819 - 2⁵ = 18736787 is a prime.

It is a super-2 number, since 2×18736819² = 702136772477522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18736849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9368409 + 9368410.

It is an arithmetic number, because the mean of its divisors is an integer number (9368410).

Almost surely, 2^18736819 is an apocalyptic number.

18736819 is a deficient number, since it is larger than the sum of its proper divisors (1).

18736819 is an equidigital number, since it uses as much as digits as its factorization.

18736819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 43.

The square root of 18736819 is about 4328.6047405602. The cubic root of 18736819 is about 265.6023748019.

The spelling of 18736819 in words is "eighteen million, seven hundred thirty-six thousand, eight hundred nineteen".