844989 has 4 divisors (see below), whose sum is σ = 1126656. Its totient is φ = 563324.

The previous prime is 844957. The next prime is 844999. The reversal of 844989 is 989448.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 844989 - 2⁵ = 844957 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 844989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (844999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140829 + ... + 140834.

It is an arithmetic number, because the mean of its divisors is an integer number (281664).

2⁸⁴⁴⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

844989 is a deficient number, since it is larger than the sum of its proper divisors (281667).

844989 is a wasteful number, since it uses less digits than its factorization.

844989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281666.

The product of its digits is 82944, while the sum is 42.

The square root of 844989 is about 919.2328323118. The cubic root of 844989 is about 94.5403092222.

The spelling of 844989 in words is "eight hundred forty-four thousand, nine hundred eighty-nine".