844990109 has 4 divisors (see below), whose sum is σ = 845114016. Its totient is φ = 844866204.

The previous prime is 844990057. The next prime is 844990121. The reversal of 844990109 is 901099448.

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 844990109 - 2⁸ = 844989853 is a prime.

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 844990109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (844990129) 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, 51089 + ... + 65574.

It is an arithmetic number, because the mean of its divisors is an integer number (211278504).

Almost surely, 2^844990109 is an apocalyptic number.

It is an amenable number.

844990109 is a deficient number, since it is larger than the sum of its proper divisors (123907).

844990109 is a wasteful number, since it uses less digits than its factorization.

844990109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123906.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 844990109 is about 29068.7135766274. The cubic root of 844990109 is about 945.4035058176.

The spelling of 844990109 in words is "eight hundred forty-four million, nine hundred ninety thousand, one hundred nine".