399619839817 has 16 divisors (see below), whose sum is σ = 464424864192. Its totient is φ = 339823019520.

The previous prime is 399619839809. The next prime is 399619839823. The reversal of 399619839817 is 718938916993.

It is a cyclic number.

It is not a de Polignac number, because 399619839817 - 2³ = 399619839809 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 399619839817.

It is not an unprimeable number, because it can be changed into a prime (399619839317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6524748 + ... + 6585709.

It is an arithmetic number, because the mean of its divisors is an integer number (29026554012).

Almost surely, 2^399619839817 is an apocalyptic number.

It is an amenable number.

399619839817 is a deficient number, since it is larger than the sum of its proper divisors (64805024375).

399619839817 is a wasteful number, since it uses less digits than its factorization.

399619839817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13110648.

The product of its digits is 158723712, while the sum is 73.

The spelling of 399619839817 in words is "three hundred ninety-nine billion, six hundred nineteen million, eight hundred thirty-nine thousand, eight hundred seventeen".