863844338939 has 2 divisors, whose sum is σ = 863844338940. Its totient is φ = 863844338938.

The previous prime is 863844338921. The next prime is 863844338957. The reversal of 863844338939 is 939833448368.

It is a balanced prime because it is at equal distance from previous prime (863844338921) and next prime (863844338957).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-863844338939 is a prime.

It is not a weakly prime, because it can be changed into another prime (863844338969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431922169469 + 431922169470.

It is an arithmetic number, because the mean of its divisors is an integer number (431922169470).

Almost surely, 2^863844338939 is an apocalyptic number.

863844338939 is a deficient number, since it is larger than the sum of its proper divisors (1).

863844338939 is an equidigital number, since it uses as much as digits as its factorization.

863844338939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 322486272, while the sum is 68.

The spelling of 863844338939 in words is "eight hundred sixty-three billion, eight hundred forty-four million, three hundred thirty-eight thousand, nine hundred thirty-nine".