685922 has 8 divisors (see below), whose sum is σ = 1034796. Its totient is φ = 340992.

The previous prime is 685907. The next prime is 685939. The reversal of 685922 is 229586.

It can be written as a sum of positive squares in 2 ways, for example, as 674041 + 11881 = 821^2 + 109^2 .

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

It is a d-powerful number, because it can be written as 6⁵ + 8 + 9⁶ + 5⁶ + 2¹⁶ + 2¹⁶ .

It is a nialpdrome in base 16.

It is an unprimeable number.

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, 503 + ... + 1274.

2⁶⁸⁵⁹²² is an apocalyptic number.

685922 is a deficient number, since it is larger than the sum of its proper divisors (348874).

685922 is a wasteful number, since it uses less digits than its factorization.

685922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1972.

The product of its digits is 8640, while the sum is 32.

The square root of 685922 is about 828.2040811298. The cubic root of 685922 is about 88.1911307183.

The spelling of 685922 in words is "six hundred eighty-five thousand, nine hundred twenty-two".