685923 has 16 divisors (see below), whose sum is σ = 1059840. Its totient is φ = 386496.

The previous prime is 685907. The next prime is 685939. The reversal of 685923 is 329586.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (685907) and next prime (685939).

It is not a de Polignac number, because 685923 - 2⁴ = 685907 is a prime.

685923 is a lucky number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (685963) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1686 + ... + 2052.

It is an arithmetic number, because the mean of its divisors is an integer number (66240).

2⁶⁸⁵⁹²³ is an apocalyptic number.

685923 is a deficient number, since it is larger than the sum of its proper divisors (373917).

685923 is a wasteful number, since it uses less digits than its factorization.

685923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466.

The product of its digits is 12960, while the sum is 33.

The square root of 685923 is about 828.2046848455. The cubic root of 685923 is about 88.1911735759.

The spelling of 685923 in words is "six hundred eighty-five thousand, nine hundred twenty-three".