809642444 has 12 divisors (see below), whose sum is σ = 1525864704. Its totient is φ = 373681104.

The previous prime is 809642443. The next prime is 809642453. The reversal of 809642444 is 444246908.

It is a super-3 number, since 3×809642444³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (809642441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7784972 + ... + 7785075.

It is an arithmetic number, because the mean of its divisors is an integer number (127155392).

Almost surely, 2^809642444 is an apocalyptic number.

It is an amenable number.

809642444 is a deficient number, since it is larger than the sum of its proper divisors (716222260).

809642444 is a wasteful number, since it uses less digits than its factorization.

809642444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15570064 (or 15570062 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 41.

The square root of 809642444 is about 28454.2166295261. The cubic root of 809642444 is about 932.0325699167.

The spelling of 809642444 in words is "eight hundred nine million, six hundred forty-two thousand, four hundred forty-four".