685947 has 8 divisors (see below), whose sum is σ = 918544. Its totient is φ = 455328.

The previous prime is 685939. The next prime is 685963. The reversal of 685947 is 749586.

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

It is not a de Polignac number, because 685947 - 2³ = 685939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 813 + ... + 1425.

It is an arithmetic number, because the mean of its divisors is an integer number (114818).

2⁶⁸⁵⁹⁴⁷ is an apocalyptic number.

685947 is a deficient number, since it is larger than the sum of its proper divisors (232597).

685947 is a wasteful number, since it uses less digits than its factorization.

685947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989.

The product of its digits is 60480, while the sum is 39.

The square root of 685947 is about 828.2191738906. The cubic root of 685947 is about 88.1922021479.

The spelling of 685947 in words is "six hundred eighty-five thousand, nine hundred forty-seven".