990039 has 8 divisors (see below), whose sum is σ = 1324672. Its totient is φ = 657720.

The previous prime is 990037. The next prime is 990043. The reversal of 990039 is 930099.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 990039 - 2¹ = 990037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 989988 and 990015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990037) 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 7 ways as a sum of consecutive naturals, for example, 1254 + ... + 1884.

It is an arithmetic number, because the mean of its divisors is an integer number (165584).

2⁹⁹⁰⁰³⁹ is an apocalyptic number.

990039 is a deficient number, since it is larger than the sum of its proper divisors (334633).

990039 is a wasteful number, since it uses less digits than its factorization.

990039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1157.

The product of its (nonzero) digits is 2187, while the sum is 30.

The square root of 990039 is about 995.0070351510. The cubic root of 990039 is about 99.6668580636. Note that the first 3 decimals are identical.

The spelling of 990039 in words is "nine hundred ninety thousand, thirty-nine".