399199658768 has 20 divisors (see below), whose sum is σ = 773672921868. Its totient is φ = 199542130560.

The previous prime is 399199658731. The next prime is 399199658801. The reversal of 399199658768 is 867856991993.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 274525698304 + 124673960464 = 523952^2 + 353092^2 .

It is a junction number, because it is equal to n+sod(n) for n = 399199658692 and 399199658701.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3549071 + ... + 3659822.

Almost surely, 2^399199658768 is an apocalyptic number.

It is an amenable number.

399199658768 is a deficient number, since it is larger than the sum of its proper divisors (374473263100).

399199658768 is a wasteful number, since it uses less digits than its factorization.

399199658768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7212362 (or 7212356 counting only the distinct ones).

The product of its digits is 1587237120, while the sum is 80.

The spelling of 399199658768 in words is "three hundred ninety-nine billion, one hundred ninety-nine million, six hundred fifty-eight thousand, seven hundred sixty-eight".