685435 has 4 divisors (see below), whose sum is σ = 822528. Its totient is φ = 548344.

The previous prime is 685429. The next prime is 685453. The reversal of 685435 is 534586.

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

It is a cyclic number.

It is not a de Polignac number, because 685435 - 2³ = 685427 is a prime.

It is a super-2 number, since 2×685435² = 939642278450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 685397 and 685406.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68539 + ... + 68548.

It is an arithmetic number, because the mean of its divisors is an integer number (205632).

2⁶⁸⁵⁴³⁵ is an apocalyptic number.

685435 is a deficient number, since it is larger than the sum of its proper divisors (137093).

685435 is a wasteful number, since it uses less digits than its factorization.

685435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137092.

The product of its digits is 14400, while the sum is 31.

The square root of 685435 is about 827.9100192654. The cubic root of 685435 is about 88.1702540738.

It can be divided in two parts, 6854 and 35, that added together give a square (6889 = 83²).

The spelling of 685435 in words is "six hundred eighty-five thousand, four hundred thirty-five".