549823 has 4 divisors (see below), whose sum is σ = 551440. Its totient is φ = 548208.

The previous prime is 549817. The next prime is 549833. The reversal of 549823 is 328945.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 328945 = 5 ⋅65789.

It is a cyclic number.

It is not a de Polignac number, because 549823 - 2¹³ = 541631 is a prime.

It is the 742-nd Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (549833) by changing a digit.

It is a nontrivial repunit in base 741.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78 + ... + 1051.

It is an arithmetic number, because the mean of its divisors is an integer number (137860).

2⁵⁴⁹⁸²³ is an apocalyptic number.

549823 is a deficient number, since it is larger than the sum of its proper divisors (1617).

549823 is a wasteful number, since it uses less digits than its factorization.

549823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1616.

The product of its digits is 8640, while the sum is 31.

The square root of 549823 is about 741.5005057315. The cubic root of 549823 is about 81.9233370343.

The spelling of 549823 in words is "five hundred forty-nine thousand, eight hundred twenty-three".