399781346827 has 2 divisors, whose sum is σ = 399781346828. Its totient is φ = 399781346826.

The previous prime is 399781346813. The next prime is 399781346843. The reversal of 399781346827 is 728643187993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399781346827 - 2¹⁵ = 399781314059 is a prime.

It is not a weakly prime, because it can be changed into another prime (399781344827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199890673413 + 199890673414.

It is an arithmetic number, because the mean of its divisors is an integer number (199890673414).

Almost surely, 2^399781346827 is an apocalyptic number.

399781346827 is a deficient number, since it is larger than the sum of its proper divisors (1).

399781346827 is an equidigital number, since it uses as much as digits as its factorization.

399781346827 is an evil number, because the sum of its binary digits is even.

The product of its digits is 109734912, while the sum is 67.

The spelling of 399781346827 in words is "three hundred ninety-nine billion, seven hundred eighty-one million, three hundred forty-six thousand, eight hundred twenty-seven".