18843439963 has 2 divisors, whose sum is σ = 18843439964. Its totient is φ = 18843439962.

The previous prime is 18843439933. The next prime is 18843440009. The reversal of 18843439963 is 36993434881.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18843439963 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18843439898 and 18843439907.

It is not a weakly prime, because it can be changed into another prime (18843439903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9421719981 + 9421719982.

It is an arithmetic number, because the mean of its divisors is an integer number (9421719982).

Almost surely, 2^18843439963 is an apocalyptic number.

18843439963 is a deficient number, since it is larger than the sum of its proper divisors (1).

18843439963 is an equidigital number, since it uses as much as digits as its factorization.

18843439963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13436928, while the sum is 58.

The spelling of 18843439963 in words is "eighteen billion, eight hundred forty-three million, four hundred thirty-nine thousand, nine hundred sixty-three".