399619839823 has 2 divisors, whose sum is σ = 399619839824. Its totient is φ = 399619839822.

The previous prime is 399619839809. The next prime is 399619839893. The reversal of 399619839823 is 328938916993.

It is an a-pointer prime, because the next prime (399619839893) can be obtained adding 399619839823 to its sum of digits (70).

It is a weak prime.

It is an emirp because it is prime and its reverse (328938916993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 399619839823 - 2⁵ = 399619839791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399619839893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199809919911 + 199809919912.

It is an arithmetic number, because the mean of its divisors is an integer number (199809919912).

Almost surely, 2^399619839823 is an apocalyptic number.

399619839823 is a deficient number, since it is larger than the sum of its proper divisors (1).

399619839823 is an equidigital number, since it uses as much as digits as its factorization.

399619839823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136048896, while the sum is 70.

The spelling of 399619839823 in words is "three hundred ninety-nine billion, six hundred nineteen million, eight hundred thirty-nine thousand, eight hundred twenty-three".