844891812 has 18 divisors (see below), whose sum is σ = 2135698838. Its totient is φ = 281630592.

The previous prime is 844891811. The next prime is 844891843. The reversal of 844891812 is 218198448.

It can be written as a sum of positive squares in only one way, i.e., 508682916 + 336208896 = 22554^2 + 18336^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (844891811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11734573 + ... + 11734644.

Almost surely, 2^844891812 is an apocalyptic number.

It is an amenable number.

844891812 is an abundant number, since it is smaller than the sum of its proper divisors (1290807026).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

844891812 is a wasteful number, since it uses less digits than its factorization.

844891812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23469227 (or 23469222 counting only the distinct ones).

The product of its digits is 147456, while the sum is 45.

The square root of 844891812 is about 29067.0227577576. The cubic root of 844891812 is about 945.3668450602.

The spelling of 844891812 in words is "eight hundred forty-four million, eight hundred ninety-one thousand, eight hundred twelve".