685415 has 12 divisors (see below), whose sum is σ = 857064. Its totient is φ = 526176.

The previous prime is 685393. The next prime is 685417. The reversal of 685415 is 514586.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-685415 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

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 polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4124 + ... + 4286.

It is an arithmetic number, because the mean of its divisors is an integer number (71422).

2⁶⁸⁵⁴¹⁵ is an apocalyptic number.

685415 is a deficient number, since it is larger than the sum of its proper divisors (171649).

685415 is a wasteful number, since it uses less digits than its factorization.

685415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226 (or 197 counting only the distinct ones).

The product of its digits is 4800, while the sum is 29.

The square root of 685415 is about 827.8979405700. The cubic root of 685415 is about 88.1693965054.

The spelling of 685415 in words is "six hundred eighty-five thousand, four hundred fifteen".