683999 has 4 divisors (see below), whose sum is σ = 687960. Its totient is φ = 680040.

The previous prime is 683983. The next prime is 684007. The reversal of 683999 is 999386.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999386 = 2 ⋅499693.

It is a cyclic number.

It is not a de Polignac number, because 683999 - 2⁴ = 683983 is a prime.

It is an Ulam number.

It is a Duffinian number.

683999 is a modest number, since divided by 999 gives 683 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (683909) 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, 1709 + ... + 2070.

It is an arithmetic number, because the mean of its divisors is an integer number (171990).

2⁶⁸³⁹⁹⁹ is an apocalyptic number.

683999 is a deficient number, since it is larger than the sum of its proper divisors (3961).

683999 is a wasteful number, since it uses less digits than its factorization.

683999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3960.

The product of its digits is 104976, while the sum is 44.

The square root of 683999 is about 827.0423205617. The cubic root of 683999 is about 88.1086382111.

The spelling of 683999 in words is "six hundred eighty-three thousand, nine hundred ninety-nine".