685742 has 4 divisors (see below), whose sum is σ = 1028616. Its totient is φ = 342870.

The previous prime is 685739. The next prime is 685747. The reversal of 685742 is 247586.

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

It is a junction number, because it is equal to n+sod(n) for n = 685699 and 685708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171434 + ... + 171437.

It is an arithmetic number, because the mean of its divisors is an integer number (257154).

2⁶⁸⁵⁷⁴² is an apocalyptic number.

685742 is a deficient number, since it is larger than the sum of its proper divisors (342874).

685742 is a wasteful number, since it uses less digits than its factorization.

685742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342873.

The product of its digits is 13440, while the sum is 32.

The square root of 685742 is about 828.0954051316. The cubic root of 685742 is about 88.1834156562.

The spelling of 685742 in words is "six hundred eighty-five thousand, seven hundred forty-two".