549640 has 64 divisors (see below), whose sum is σ = 1532160. Its totient is φ = 172800.

The previous prime is 549623. The next prime is 549641. The reversal of 549640 is 46945.

549640 is nontrivially palindromic in base 15.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 549599 and 549608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (549641) by changing a digit.

549640 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3565 + ... + 3715.

It is an arithmetic number, because the mean of its divisors is an integer number (23940).

2⁵⁴⁹⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 549640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (766080).

549640 is an abundant number, since it is smaller than the sum of its proper divisors (982520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

549640 is a wasteful number, since it uses less digits than its factorization.

549640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182 (or 178 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 549640 is about 741.3770970296. The cubic root of 549640 is about 81.9142470580.

The spelling of 549640 in words is "five hundred forty-nine thousand, six hundred forty".