18243360439 has 4 divisors (see below), whose sum is σ = 18309221224. Its totient is φ = 18177499656.

The previous prime is 18243360437. The next prime is 18243360449. The reversal of 18243360439 is 93406334281.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18243360439 - 2¹ = 18243360437 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18243360395 and 18243360404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18243360437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32929977 + ... + 32930530.

It is an arithmetic number, because the mean of its divisors is an integer number (4577305306).

Almost surely, 2^18243360439 is an apocalyptic number.

18243360439 is a deficient number, since it is larger than the sum of its proper divisors (65860785).

18243360439 is an equidigital number, since it uses as much as digits as its factorization.

18243360439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65860784.

The product of its (nonzero) digits is 373248, while the sum is 43.

The spelling of 18243360439 in words is "eighteen billion, two hundred forty-three million, three hundred sixty thousand, four hundred thirty-nine".