549685 has 4 divisors (see below), whose sum is σ = 659628. Its totient is φ = 439744.

The previous prime is 549683. The next prime is 549691. The reversal of 549685 is 586945.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 586945 = 5 ⋅117389.

It can be written as a sum of positive squares in 2 ways, for example, as 148996 + 400689 = 386^2 + 633^2 .

It is a cyclic number.

It is not a de Polignac number, because 549685 - 2¹ = 549683 is a prime.

It is a Duffinian number.

549685 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (549683) 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, 54964 + ... + 54973.

It is an arithmetic number, because the mean of its divisors is an integer number (164907).

2⁵⁴⁹⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

549685 is a deficient number, since it is larger than the sum of its proper divisors (109943).

549685 is a wasteful number, since it uses less digits than its factorization.

549685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109942.

The product of its digits is 43200, while the sum is 37.

The square root of 549685 is about 741.4074453362. The cubic root of 549685 is about 81.9164824851.

The spelling of 549685 in words is "five hundred forty-nine thousand, six hundred eighty-five".