990439 has 4 divisors (see below), whose sum is σ = 1002456. Its totient is φ = 978424.

The previous prime is 990397. The next prime is 990463. The reversal of 990439 is 934099.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990439 is a prime.

It is a Duffinian number.

990439 is a lucky number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990469) 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 3 ways as a sum of consecutive naturals, for example, 5884 + ... + 6049.

It is an arithmetic number, because the mean of its divisors is an integer number (250614).

2⁹⁹⁰⁴³⁹ is an apocalyptic number.

990439 is a deficient number, since it is larger than the sum of its proper divisors (12017).

990439 is a wasteful number, since it uses less digits than its factorization.

990439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12016.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 990439 is about 995.2080184564. The cubic root of 990439 is about 99.6802788734.

The spelling of 990439 in words is "nine hundred ninety thousand, four hundred thirty-nine".