399686399999999 has 8 divisors (see below), whose sum is σ = 456785725442208. Its totient is φ = 342587391632640.

The previous prime is 399686399999993. The next prime is 399686400000071. The reversal of 399686399999999 is 999999993686993.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 399686399999999 - 2⁴⁸ = 118211423289343 is a prime.

It is a Duffinian number.

399686399999999 is a modest number, since divided by 99999999 gives 3996863 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399686399999993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76561382 + ... + 81615059.

It is an arithmetic number, because the mean of its divisors is an integer number (57098215680276).

Almost surely, 2^{399686399999999} is an apocalyptic number.

399686399999999 is a deficient number, since it is larger than the sum of its proper divisors (57099325442209).

399686399999999 is a wasteful number, since it uses less digits than its factorization.

399686399999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158537425.

The product of its digits is 9037745167392, while the sum is 116.

The spelling of 399686399999999 in words is "three hundred ninety-nine trillion, six hundred eighty-six billion, three hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".