399877 has 4 divisors (see below), whose sum is σ = 404460. Its totient is φ = 395296.

The previous prime is 399871. The next prime is 399887. The reversal of 399877 is 778993.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 276676 + 123201 = 526^2 + 351^2 .

It is a cyclic number.

It is not a de Polignac number, because 399877 - 2¹¹ = 397829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2158 + ... + 2335.

It is an arithmetic number, because the mean of its divisors is an integer number (101115).

2³⁹⁹⁸⁷⁷ is an apocalyptic number.

It is an amenable number.

399877 is a deficient number, since it is larger than the sum of its proper divisors (4583).

399877 is an equidigital number, since it uses as much as digits as its factorization.

399877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4582.

The product of its digits is 95256, while the sum is 43.

The square root of 399877 is about 632.3582845191. The cubic root of 399877 is about 73.6730769340.

The spelling of 399877 in words is "three hundred ninety-nine thousand, eight hundred seventy-seven".