685403 has 4 divisors (see below), whose sum is σ = 697080. Its totient is φ = 673728.

The previous prime is 685393. The next prime is 685417. The reversal of 685403 is 304586.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 304586 = 2 ⋅152293.

It is a cyclic number.

It is not a de Polignac number, because 685403 - 2⁶ = 685339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685453) 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, 5750 + ... + 5867.

It is an arithmetic number, because the mean of its divisors is an integer number (174270).

2⁶⁸⁵⁴⁰³ is an apocalyptic number.

685403 is a deficient number, since it is larger than the sum of its proper divisors (11677).

685403 is a wasteful number, since it uses less digits than its factorization.

685403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11676.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 685403 is about 827.8906932681. The cubic root of 685403 is about 88.1688819563.

Adding to 685403 its reverse (304586), we get a palindrome (989989).

The spelling of 685403 in words is "six hundred eighty-five thousand, four hundred three".