685437 has 4 divisors (see below), whose sum is σ = 913920. Its totient is φ = 456956.

The previous prime is 685429. The next prime is 685453. The reversal of 685437 is 734586.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 685437 - 2³ = 685429 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 685398 and 685407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685417) by changing a digit.

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, 114237 + ... + 114242.

It is an arithmetic number, because the mean of its divisors is an integer number (228480).

2⁶⁸⁵⁴³⁷ is an apocalyptic number.

It is an amenable number.

685437 is a deficient number, since it is larger than the sum of its proper divisors (228483).

685437 is a wasteful number, since it uses less digits than its factorization.

685437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228482.

The product of its digits is 20160, while the sum is 33.

The square root of 685437 is about 827.9112271252. The cubic root of 685437 is about 88.1703398297.

The spelling of 685437 in words is "six hundred eighty-five thousand, four hundred thirty-seven".