990099 has 24 divisors (see below), whose sum is σ = 1593072. Its totient is φ = 587520.

The previous prime is 990053. The next prime is 990137.

990099 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 990099 - 2⁷ = 989971 is a prime.

990099 is a lucky number.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (990599) 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, 7159 + ... + 7295.

It is an arithmetic number, because the mean of its divisors is an integer number (66378).

2⁹⁹⁰⁰⁹⁹ is an apocalyptic number.

990099 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

990099 is a deficient number, since it is larger than the sum of its proper divisors (602973).

990099 is a wasteful number, since it uses less digits than its factorization.

990099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227 (or 224 counting only the distinct ones).

The product of its (nonzero) digits is 6561, while the sum is 36.

The square root of 990099 is about 995.0371852348. The cubic root of 990099 is about 99.6688714155.

It can be divided in two parts, 9900 and 99, that multiplied together give a square (980100 = 990²).

The spelling of 990099 in words is "nine hundred ninety thousand, ninety-nine".