18743839 has 2 divisors, whose sum is σ = 18743840. Its totient is φ = 18743838.

The previous prime is 18743801. The next prime is 18743849. The reversal of 18743839 is 93834781.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18743839 - 2⁹ = 18743327 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18743795 and 18743804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18743849) 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, 9371919 + 9371920.

It is an arithmetic number, because the mean of its divisors is an integer number (9371920).

Almost surely, 2^18743839 is an apocalyptic number.

18743839 is a deficient number, since it is larger than the sum of its proper divisors (1).

18743839 is an equidigital number, since it uses as much as digits as its factorization.

18743839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 43.

The square root of 18743839 is about 4329.4155494709. The cubic root of 18743839 is about 265.6355411549.

The spelling of 18743839 in words is "eighteen million, seven hundred forty-three thousand, eight hundred thirty-nine".