844223981 has 4 divisors (see below), whose sum is σ = 845076864. Its totient is φ = 843371100.

The previous prime is 844223971. The next prime is 844224037. The reversal of 844223981 is 189322448.

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 844223981 - 2¹⁰ = 844222957 is a prime.

It is a super-2 number, since 2×844223981² = 1425428260190976722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (844223971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 424955 + ... + 426936.

It is an arithmetic number, because the mean of its divisors is an integer number (211269216).

Almost surely, 2^844223981 is an apocalyptic number.

It is an amenable number.

844223981 is a deficient number, since it is larger than the sum of its proper divisors (852883).

844223981 is an equidigital number, since it uses as much as digits as its factorization.

844223981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852882.

The product of its digits is 110592, while the sum is 41.

The square root of 844223981 is about 29055.5327089351. The cubic root of 844223981 is about 945.1176961178.

It can be divided in two parts, 8442 and 23981, that added together give a palindrome (32423).

The spelling of 844223981 in words is "eight hundred forty-four million, two hundred twenty-three thousand, nine hundred eighty-one".