399829 has 6 divisors (see below), whose sum is σ = 410774. Its totient is φ = 389160.

The previous prime is 399793. The next prime is 399851. The reversal of 399829 is 928993.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 220900 + 178929 = 470^2 + 423^2 .

It is not a de Polignac number, because 399829 - 2¹⁷ = 268757 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 399791 and 399800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399899) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2119 + ... + 2299.

2³⁹⁹⁸²⁹ is an apocalyptic number.

It is an amenable number.

399829 is a deficient number, since it is larger than the sum of its proper divisors (10945).

399829 is an equidigital number, since it uses as much as digits as its factorization.

399829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275 (or 228 counting only the distinct ones).

The product of its digits is 34992, while the sum is 40.

The square root of 399829 is about 632.3203302125. The cubic root of 399829 is about 73.6701289865.

The spelling of 399829 in words is "three hundred ninety-nine thousand, eight hundred twenty-nine".