399826 has 8 divisors (see below), whose sum is σ = 685440. Its totient is φ = 171348.

The previous prime is 399793. The next prime is 399851. The reversal of 399826 is 628993.

399826 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

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, 14266 + ... + 14293.

It is an arithmetic number, because the mean of its divisors is an integer number (85680).

2³⁹⁹⁸²⁶ is an apocalyptic number.

399826 is a deficient number, since it is larger than the sum of its proper divisors (285614).

399826 is a wasteful number, since it uses less digits than its factorization.

399826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28568.

The product of its digits is 23328, while the sum is 37.

The square root of 399826 is about 632.3179579927. The cubic root of 399826 is about 73.6699447320.

It can be divided in two parts, 399 and 826, that added together give a triangular number (1225 = T₄₉).

The spelling of 399826 in words is "three hundred ninety-nine thousand, eight hundred twenty-six".