685405 has 8 divisors (see below), whose sum is σ = 940032. Its totient is φ = 469968.

The previous prime is 685393. The next prime is 685417. The reversal of 685405 is 504586.

It is an interprime number because it is at equal distance from previous prime (685393) and next prime (685417).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 685405 - 2¹¹ = 683357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9757 + ... + 9826.

It is an arithmetic number, because the mean of its divisors is an integer number (117504).

2⁶⁸⁵⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

685405 is a deficient number, since it is larger than the sum of its proper divisors (254627).

685405 is a wasteful number, since it uses less digits than its factorization.

685405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19595.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 685405 is about 827.8919011562. The cubic root of 685405 is about 88.1689677149.

The spelling of 685405 in words is "six hundred eighty-five thousand, four hundred five".