399860844767 has 2 divisors, whose sum is σ = 399860844768. Its totient is φ = 399860844766.

The previous prime is 399860844763. The next prime is 399860844827. The reversal of 399860844767 is 767448068993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399860844767 - 2² = 399860844763 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 399860844767.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399860844763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199930422383 + 199930422384.

It is an arithmetic number, because the mean of its divisors is an integer number (199930422384).

Almost surely, 2^399860844767 is an apocalyptic number.

399860844767 is a deficient number, since it is larger than the sum of its proper divisors (1).

399860844767 is an equidigital number, since it uses as much as digits as its factorization.

399860844767 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 438939648, while the sum is 71.

The spelling of 399860844767 in words is "three hundred ninety-nine billion, eight hundred sixty million, eight hundred forty-four thousand, seven hundred sixty-seven".