399837 has 4 divisors (see below), whose sum is σ = 533120. Its totient is φ = 266556.

The previous prime is 399793. The next prime is 399851. The reversal of 399837 is 738993.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 399837 - 2¹⁰ = 398813 is a prime.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 399795 and 399804.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66637 + ... + 66642.

It is an arithmetic number, because the mean of its divisors is an integer number (133280).

2³⁹⁹⁸³⁷ is an apocalyptic number.

It is an amenable number.

399837 is a deficient number, since it is larger than the sum of its proper divisors (133283).

399837 is a wasteful number, since it uses less digits than its factorization.

399837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133282.

The product of its digits is 40824, while the sum is 39.

The square root of 399837 is about 632.3266560884. The cubic root of 399837 is about 73.6706203275.

The spelling of 399837 in words is "three hundred ninety-nine thousand, eight hundred thirty-seven".