685387 has 4 divisors (see below), whose sum is σ = 721480. Its totient is φ = 649296.

The previous prime is 685381. The next prime is 685393. The reversal of 685387 is 783586.

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

It is an interprime number because it is at equal distance from previous prime (685381) and next prime (685393).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685381) 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 3 ways as a sum of consecutive naturals, for example, 18018 + ... + 18055.

It is an arithmetic number, because the mean of its divisors is an integer number (180370).

2⁶⁸⁵³⁸⁷ is an apocalyptic number.

685387 is a deficient number, since it is larger than the sum of its proper divisors (36093).

685387 is a wasteful number, since it uses less digits than its factorization.

685387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36092.

The product of its digits is 40320, while the sum is 37.

The square root of 685387 is about 827.8810301003. The cubic root of 685387 is about 88.1681958815.

The spelling of 685387 in words is "six hundred eighty-five thousand, three hundred eighty-seven".