399943 has 8 divisors (see below), whose sum is σ = 418176. Its totient is φ = 382200.

The previous prime is 399941. The next prime is 399953. The reversal of 399943 is 349993.

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 399943 - 2¹ = 399941 is a prime.

It is a d-powerful number, because it can be written as 3⁹ + 9 + 9 + 9⁵ + 4⁹ + 3¹⁰ .

It is a Duffinian number.

399943 is a Rhonda number in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399941) 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, 2988 + ... + 3118.

It is an arithmetic number, because the mean of its divisors is an integer number (52272).

2³⁹⁹⁹⁴³ is an apocalyptic number.

399943 is a deficient number, since it is larger than the sum of its proper divisors (18233).

399943 is a wasteful number, since it uses less digits than its factorization.

399943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245.

The product of its digits is 26244, while the sum is 37.

The square root of 399943 is about 632.4104679716. The cubic root of 399943 is about 73.6771299766.

The spelling of 399943 in words is "three hundred ninety-nine thousand, nine hundred forty-three".