989819 has 4 divisors (see below), whose sum is σ = 997080. Its totient is φ = 982560.

The previous prime is 989803. The next prime is 989827. The reversal of 989819 is 918989.

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

It is a cyclic number.

It is not a de Polignac number, because 989819 - 2⁴ = 989803 is a prime.

It is a super-2 number, since 2×989819² = 1959483305522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 989819.

It is not an unprimeable number, because it can be changed into a prime (989839) 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, 3422 + ... + 3699.

It is an arithmetic number, because the mean of its divisors is an integer number (249270).

2⁹⁸⁹⁸¹⁹ is an apocalyptic number.

989819 is a deficient number, since it is larger than the sum of its proper divisors (7261).

989819 is a wasteful number, since it uses less digits than its factorization.

989819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7260.

The product of its digits is 46656, while the sum is 44.

The square root of 989819 is about 994.8964770266. The cubic root of 989819 is about 99.6594750773.

The spelling of 989819 in words is "nine hundred eighty-nine thousand, eight hundred nineteen".