685407 has 4 divisors (see below), whose sum is σ = 913880. Its totient is φ = 456936.

The previous prime is 685393. The next prime is 685417. The reversal of 685407 is 704586.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 685407 - 2¹² = 681311 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114232 + ... + 114237.

It is an arithmetic number, because the mean of its divisors is an integer number (228470).

2⁶⁸⁵⁴⁰⁷ is an apocalyptic number.

685407 is a deficient number, since it is larger than the sum of its proper divisors (228473).

685407 is a wasteful number, since it uses less digits than its factorization.

685407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228472.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 685407 is about 827.8931090425. The cubic root of 685407 is about 88.1690534733.

The spelling of 685407 in words is "six hundred eighty-five thousand, four hundred seven".