685243 has 4 divisors (see below), whose sum is σ = 737968. Its totient is φ = 632520.

The previous prime is 685231. The next prime is 685247. The reversal of 685243 is 342586.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342586 = 2 ⋅171293.

It is a cyclic number.

It is not a de Polignac number, because 685243 - 2⁹ = 684731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26343 + ... + 26368.

It is an arithmetic number, because the mean of its divisors is an integer number (184492).

2⁶⁸⁵²⁴³ is an apocalyptic number.

685243 is a deficient number, since it is larger than the sum of its proper divisors (52725).

685243 is a wasteful number, since it uses less digits than its factorization.

685243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52724.

The product of its digits is 5760, while the sum is 28.

The square root of 685243 is about 827.7940565141. The cubic root of 685243 is about 88.1620207282.

The spelling of 685243 in words is "six hundred eighty-five thousand, two hundred forty-three".