549990 has 80 divisors (see below), whose sum is σ = 1707552. Its totient is φ = 124416.

The previous prime is 549979. The next prime is 550007. The reversal of 549990 is 99945.

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 549990.

It is an unprimeable number.

549990 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 39 ways as a sum of consecutive naturals, for example, 5622 + ... + 5718.

2⁵⁴⁹⁹⁹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 549990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (853776).

549990 is an abundant number, since it is smaller than the sum of its proper divisors (1157562).

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

549990 is a wasteful number, since it uses less digits than its factorization.

549990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123 (or 114 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 36.

The square root of 549990 is about 741.6131066803. The cubic root of 549990 is about 81.9316304987.

The spelling of 549990 in words is "five hundred forty-nine thousand, nine hundred ninety".