684799 has 2 divisors, whose sum is σ = 684800. Its totient is φ = 684798.

The previous prime is 684793. The next prime is 684809. The reversal of 684799 is 997486.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 684799 - 2³ = 684791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (684791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342399 + 342400.

It is an arithmetic number, because the mean of its divisors is an integer number (342400).

2⁶⁸⁴⁷⁹⁹ is an apocalyptic number.

684799 is a deficient number, since it is larger than the sum of its proper divisors (1).

684799 is an equidigital number, since it uses as much as digits as its factorization.

684799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 43.

The square root of 684799 is about 827.5258304126. The cubic root of 684799 is about 88.1429752243.

The spelling of 684799 in words is "six hundred eighty-four thousand, seven hundred ninety-nine".