685429 has 2 divisors, whose sum is σ = 685430. Its totient is φ = 685428.

The previous prime is 685427. The next prime is 685453. The reversal of 685429 is 924586.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 677329 + 8100 = 823^2 + 90^2 .

It is a cyclic number.

It is not a de Polignac number, because 685429 - 2¹ = 685427 is a prime.

Together with 685427, it forms a pair of twin primes.

685429 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 685394 and 685403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342714 + 342715.

It is an arithmetic number, because the mean of its divisors is an integer number (342715).

2⁶⁸⁵⁴²⁹ is an apocalyptic number.

It is an amenable number.

685429 is a deficient number, since it is larger than the sum of its proper divisors (1).

685429 is an equidigital number, since it uses as much as digits as its factorization.

685429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 34.

The square root of 685429 is about 827.9063956753. The cubic root of 685429 is about 88.1699968050.

The spelling of 685429 in words is "six hundred eighty-five thousand, four hundred twenty-nine".