685390 has 8 divisors (see below), whose sum is σ = 1233720. Its totient is φ = 274152.

The previous prime is 685381. The next prime is 685393. The reversal of 685390 is 93586.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685393) 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, 34260 + ... + 34279.

It is an arithmetic number, because the mean of its divisors is an integer number (154215).

2⁶⁸⁵³⁹⁰ is an apocalyptic number.

685390 is a deficient number, since it is larger than the sum of its proper divisors (548330).

685390 is a wasteful number, since it uses less digits than its factorization.

685390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68546.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 685390 is about 827.8828419529. The cubic root of 685390 is about 88.1683245214.

The spelling of 685390 in words is "six hundred eighty-five thousand, three hundred ninety".