18742819 has 2 divisors, whose sum is σ = 18742820. Its totient is φ = 18742818.

The previous prime is 18742741. The next prime is 18742847. The reversal of 18742819 is 91824781.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18742819 - 2⁹ = 18742307 is a prime.

It is a super-2 number, since 2×18742819² = 702586528133522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18742849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9371409 + 9371410.

It is an arithmetic number, because the mean of its divisors is an integer number (9371410).

Almost surely, 2^18742819 is an apocalyptic number.

18742819 is a deficient number, since it is larger than the sum of its proper divisors (1).

18742819 is an equidigital number, since it uses as much as digits as its factorization.

18742819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 40.

The square root of 18742819 is about 4329.2977490582. The cubic root of 18742819 is about 265.6307226264.

The spelling of 18742819 in words is "eighteen million, seven hundred forty-two thousand, eight hundred nineteen".