990055 has 16 divisors (see below), whose sum is σ = 1327104. Its totient is φ = 702880.

The previous prime is 990053. The next prime is 990137. The reversal of 990055 is 550099.

It is not a de Polignac number, because 990055 - 2¹ = 990053 is a prime.

It is a Duffinian number.

990055 is a lucky number.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2394 + ... + 2776.

It is an arithmetic number, because the mean of its divisors is an integer number (82944).

2⁹⁹⁰⁰⁵⁵ is an apocalyptic number.

990055 is a deficient number, since it is larger than the sum of its proper divisors (337049).

990055 is a wasteful number, since it uses less digits than its factorization.

990055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446.

The product of its (nonzero) digits is 2025, while the sum is 28.

The square root of 990055 is about 995.0150752627. The cubic root of 990055 is about 99.6673949654.

The spelling of 990055 in words is "nine hundred ninety thousand, fifty-five".