549405 has 24 divisors (see below), whose sum is σ = 987480. Its totient is φ = 282240.

The previous prime is 549403. The next prime is 549421. The reversal of 549405 is 504945.

It can be written as a sum of positive squares in 4 ways, for example, as 324 + 549081 = 18^2 + 741^2 .

It is not a de Polignac number, because 549405 - 2¹ = 549403 is a prime.

549405 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 549405.

It is not an unprimeable number, because it can be changed into a prime (549403) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1095 + ... + 1515.

It is an arithmetic number, because the mean of its divisors is an integer number (41145).

2⁵⁴⁹⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

549405 is a deficient number, since it is larger than the sum of its proper divisors (438075).

549405 is a wasteful number, since it uses less digits than its factorization.

549405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461 (or 458 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 549405 is about 741.2185912401. The cubic root of 549405 is about 81.9025711779.

It can be divided in two parts, 54940 and 5, that added together give a palindrome (54945).

The spelling of 549405 in words is "five hundred forty-nine thousand, four hundred five".