399785421439 has 2 divisors, whose sum is σ = 399785421440. Its totient is φ = 399785421438.

The previous prime is 399785421437. The next prime is 399785421443. The reversal of 399785421439 is 934124587993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399785421439 - 2¹ = 399785421437 is a prime.

Together with 399785421437, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399785421437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199892710719 + 199892710720.

It is an arithmetic number, because the mean of its divisors is an integer number (199892710720).

Almost surely, 2^399785421439 is an apocalyptic number.

399785421439 is a deficient number, since it is larger than the sum of its proper divisors (1).

399785421439 is an equidigital number, since it uses as much as digits as its factorization.

399785421439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58786560, while the sum is 64.

The spelling of 399785421439 in words is "three hundred ninety-nine billion, seven hundred eighty-five million, four hundred twenty-one thousand, four hundred thirty-nine".