990549 has 20 divisors (see below), whose sum is σ = 1692064. Its totient is φ = 565704.

The previous prime is 990547. The next prime is 990559. The reversal of 990549 is 945099.

It is not a de Polignac number, because 990549 - 2¹ = 990547 is a prime.

It is a Duffinian number.

It is a Curzon 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 990549.

It is not an unprimeable number, because it can be changed into a prime (990547) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 307 + ... + 1440.

2⁹⁹⁰⁵⁴⁹ is an apocalyptic number.

It is an amenable number.

990549 is a deficient number, since it is larger than the sum of its proper divisors (701515).

990549 is a wasteful number, since it uses less digits than its factorization.

990549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1766 (or 1757 counting only the distinct ones).

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

The square root of 990549 is about 995.2632817501. The cubic root of 990549 is about 99.6839689626.

The spelling of 990549 in words is "nine hundred ninety thousand, five hundred forty-nine".