343999 has 4 divisors (see below), whose sum is σ = 345240. Its totient is φ = 342760.

The previous prime is 343997. The next prime is 344017. The reversal of 343999 is 999343.

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 343999 - 2¹ = 343997 is a prime.

It is a Duffinian number.

343999 is a modest number, since divided by 999 gives 343 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (343997) 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, 9 + ... + 829.

It is an arithmetic number, because the mean of its divisors is an integer number (86310).

2³⁴³⁹⁹⁹ is an apocalyptic number.

343999 is a deficient number, since it is larger than the sum of its proper divisors (1241).

343999 is an equidigital number, since it uses as much as digits as its factorization.

343999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1240.

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

The square root of 343999 is about 586.5142794511. The cubic root of 343999 is about 70.0678933124.

The spelling of 343999 in words is "three hundred forty-three thousand, nine hundred ninety-nine".