399873 has 8 divisors (see below), whose sum is σ = 546336. Its totient is φ = 260000.

The previous prime is 399871. The next prime is 399887. The reversal of 399873 is 378993.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 399873 - 2¹ = 399871 is a prime.

It is a super-2 number, since 2×399873² = 319796832258, which contains 22 as substring.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1503 + ... + 1748.

It is an arithmetic number, because the mean of its divisors is an integer number (68292).

2³⁹⁹⁸⁷³ is an apocalyptic number.

It is an amenable number.

399873 is a deficient number, since it is larger than the sum of its proper divisors (146463).

399873 is a wasteful number, since it uses less digits than its factorization.

399873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3295.

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

The square root of 399873 is about 632.3551217473. The cubic root of 399873 is about 73.6728312807.

The spelling of 399873 in words is "three hundred ninety-nine thousand, eight hundred seventy-three".