399686255 has 8 divisors (see below), whose sum is σ = 495095424. Its totient is φ = 309434400.

The previous prime is 399686239. The next prime is 399686267. The reversal of 399686255 is 552686993.

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

It is not a de Polignac number, because 399686255 - 2⁴ = 399686239 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 399686197 and 399686206.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1289156 + ... + 1289465.

It is an arithmetic number, because the mean of its divisors is an integer number (61886928).

Almost surely, 2^399686255 is an apocalyptic number.

399686255 is a deficient number, since it is larger than the sum of its proper divisors (95409169).

399686255 is a wasteful number, since it uses less digits than its factorization.

399686255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2578657.

The product of its digits is 3499200, while the sum is 53.

The square root of 399686255 is about 19992.1548363352. The cubic root of 399686255 is about 736.6136082622.

The spelling of 399686255 in words is "three hundred ninety-nine million, six hundred eighty-six thousand, two hundred fifty-five".