685042 has 4 divisors (see below), whose sum is σ = 1027566. Its totient is φ = 342520.

The previous prime is 685039. The next prime is 685051. The reversal of 685042 is 240586.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 240586 = 2 ⋅120293.

It can be written as a sum of positive squares in only one way, i.e., 594441 + 90601 = 771^2 + 301^2 .

It is a junction number, because it is equal to n+sod(n) for n = 684998 and 685016.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171259 + ... + 171262.

2⁶⁸⁵⁰⁴² is an apocalyptic number.

685042 is a deficient number, since it is larger than the sum of its proper divisors (342524).

685042 is a wasteful number, since it uses less digits than its factorization.

685042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342523.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 685042 is about 827.6726406013. The cubic root of 685042 is about 88.1533997966.

The spelling of 685042 in words is "six hundred eighty-five thousand, forty-two".