18443600839 has 2 divisors, whose sum is σ = 18443600840. Its totient is φ = 18443600838.

The previous prime is 18443600831. The next prime is 18443600881. The reversal of 18443600839 is 93800634481.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18443600839 - 2³ = 18443600831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18443600831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9221800419 + 9221800420.

It is an arithmetic number, because the mean of its divisors is an integer number (9221800420).

Almost surely, 2^18443600839 is an apocalyptic number.

18443600839 is a deficient number, since it is larger than the sum of its proper divisors (1).

18443600839 is an equidigital number, since it uses as much as digits as its factorization.

18443600839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 497664, while the sum is 46.

The spelling of 18443600839 in words is "eighteen billion, four hundred forty-three million, six hundred thousand, eight hundred thirty-nine".