399071706881 has 2 divisors, whose sum is σ = 399071706882. Its totient is φ = 399071706880.

The previous prime is 399071706863. The next prime is 399071706977. The reversal of 399071706881 is 188607170993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 373668128656 + 25403578225 = 611284^2 + 159385^2 .

It is a cyclic number.

It is not a de Polignac number, because 399071706881 - 2³⁸ = 124193799937 is a prime.

It is a super-2 number, since 2×399071706881² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 399071706881.

It is not a weakly prime, because it can be changed into another prime (399071706821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199535853440 + 199535853441.

It is an arithmetic number, because the mean of its divisors is an integer number (199535853441).

Almost surely, 2^399071706881 is an apocalyptic number.

It is an amenable number.

399071706881 is a deficient number, since it is larger than the sum of its proper divisors (1).

399071706881 is an equidigital number, since it uses as much as digits as its factorization.

399071706881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4572288, while the sum is 59.

The spelling of 399071706881 in words is "three hundred ninety-nine billion, seventy-one million, seven hundred six thousand, eight hundred eighty-one".