844400709 has 12 divisors (see below), whose sum is σ = 1236398956. Its totient is φ = 555221952.

The previous prime is 844400701. The next prime is 844400719. The reversal of 844400709 is 907004448.

It can be written as a sum of positive squares in 2 ways, for example, as 590635809 + 253764900 = 24303^2 + 15930^2 .

It is not a de Polignac number, because 844400709 - 2³ = 844400701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (844400701) 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 11 ways as a sum of consecutive naturals, for example, 641962 + ... + 643275.

Almost surely, 2^844400709 is an apocalyptic number.

It is an amenable number.

844400709 is a deficient number, since it is larger than the sum of its proper divisors (391998247).

844400709 is a wasteful number, since it uses less digits than its factorization.

844400709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1285316 (or 1285313 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 844400709 is about 29058.5737605960. The cubic root of 844400709 is about 945.1836411396.

The spelling of 844400709 in words is "eight hundred forty-four million, four hundred thousand, seven hundred nine".