684379 has 2 divisors, whose sum is σ = 684380. Its totient is φ = 684378.

The previous prime is 684373. The next prime is 684407. The reversal of 684379 is 973486.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 684379 - 2⁵ = 684347 is a prime.

It is a super-3 number, since 3×684379³ = 961637253233315817, which contains 333 as substring.

It is a Chen prime.

684379 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (684373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342189 + 342190.

It is an arithmetic number, because the mean of its divisors is an integer number (342190).

2⁶⁸⁴³⁷⁹ is an apocalyptic number.

684379 is a deficient number, since it is larger than the sum of its proper divisors (1).

684379 is an equidigital number, since it uses as much as digits as its factorization.

684379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 37.

The square root of 684379 is about 827.2720229767. The cubic root of 684379 is about 88.1249516288.

Subtracting from 684379 its product of digits (36288), we obtain a triangular number (648091 = T₁₁₃₈).

The spelling of 684379 in words is "six hundred eighty-four thousand, three hundred seventy-nine".