684043 has 4 divisors (see below), whose sum is σ = 713808. Its totient is φ = 654280.

The previous prime is 684037. The next prime is 684053. The reversal of 684043 is 340486.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 340486 = 2 ⋅170243.

It is a cyclic number.

It is not a de Polignac number, because 684043 - 2¹⁷ = 552971 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 683999 and 684017.

It is not an unprimeable number, because it can be changed into a prime (684053) 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, 14848 + ... + 14893.

It is an arithmetic number, because the mean of its divisors is an integer number (178452).

2⁶⁸⁴⁰⁴³ is an apocalyptic number.

684043 is a deficient number, since it is larger than the sum of its proper divisors (29765).

684043 is a wasteful number, since it uses less digits than its factorization.

684043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29764.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 684043 is about 827.0689209492. The cubic root of 684043 is about 88.1105274424.

The spelling of 684043 in words is "six hundred eighty-four thousand, forty-three".