685426 has 16 divisors (see below), whose sum is σ = 1185984. Its totient is φ = 291024.

The previous prime is 685417. The next prime is 685427. The reversal of 685426 is 624586.

685426 is nontrivially palindromic in base 13.

It is a nialpdrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (685427) 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 in 7 ways as a sum of consecutive naturals, for example, 2281 + ... + 2563.

It is an arithmetic number, because the mean of its divisors is an integer number (74124).

2⁶⁸⁵⁴²⁶ is an apocalyptic number.

685426 is a deficient number, since it is larger than the sum of its proper divisors (500558).

685426 is a wasteful number, since it uses less digits than its factorization.

685426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465.

The product of its digits is 11520, while the sum is 31.

The square root of 685426 is about 827.9045838743. The cubic root of 685426 is about 88.1698681701.

It can be divided in two parts, 685 and 426, that added together give a palindrome (1111).

The spelling of 685426 in words is "six hundred eighty-five thousand, four hundred twenty-six".