8409744 has 140 divisors (see below), whose sum is σ = 28190656. Its totient is φ = 2379456.

The previous prime is 8409721. The next prime is 8409829. The reversal of 8409744 is 4479048.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 8409699 and 8409708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 81597 + ... + 81699.

Almost surely, 2^8409744 is an apocalyptic number.

8409744 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8409744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14095328).

8409744 is an abundant number, since it is smaller than the sum of its proper divisors (19780912).

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

8409744 is a wasteful number, since it uses less digits than its factorization.

8409744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136 (or 115 counting only the distinct ones).

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

The square root of 8409744 is about 2899.9558617331. The cubic root of 8409744 is about 203.3578423083.

The spelling of 8409744 in words is "eight million, four hundred nine thousand, seven hundred forty-four".