399828 has 48 divisors (see below), whose sum is σ = 1100736. Its totient is φ = 111360.

The previous prime is 399793. The next prime is 399851. The reversal of 399828 is 828993.

399828 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

399828 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1600 + ... + 1832.

It is an arithmetic number, because the mean of its divisors is an integer number (22932).

2³⁹⁹⁸²⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (550368).

399828 is an abundant number, since it is smaller than the sum of its proper divisors (700908).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399828 is a wasteful number, since it uses less digits than its factorization.

399828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264 (or 262 counting only the distinct ones).

The product of its digits is 31104, while the sum is 39.

The square root of 399828 is about 632.3195394735. The cubic root of 399828 is about 73.6700675684.

The spelling of 399828 in words is "three hundred ninety-nine thousand, eight hundred twenty-eight".