399827 has 4 divisors (see below), whose sum is σ = 401136. Its totient is φ = 398520.

The previous prime is 399793. The next prime is 399851. The reversal of 399827 is 728993.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 399827 - 2⁸ = 399571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77 + ... + 897.

It is an arithmetic number, because the mean of its divisors is an integer number (100284).

2³⁹⁹⁸²⁷ is an apocalyptic number.

399827 is a deficient number, since it is larger than the sum of its proper divisors (1309).

399827 is an equidigital number, since it uses as much as digits as its factorization.

399827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1308.

The product of its digits is 27216, while the sum is 38.

The square root of 399827 is about 632.3187487336. The cubic root of 399827 is about 73.6700061502.

The spelling of 399827 in words is "three hundred ninety-nine thousand, eight hundred twenty-seven".