809399448 has 192 divisors, whose sum is σ = 2599833600. Its totient is φ = 224259840.

The previous prime is 809399443. The next prime is 809399471. The reversal of 809399448 is 844993908.

It is a junction number, because it is equal to n+sod(n) for n = 809399394 and 809399403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809399443) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1307283 + ... + 1307901.

It is an arithmetic number, because the mean of its divisors is an integer number (13540800).

Almost surely, 2^809399448 is an apocalyptic number.

809399448 is a gapful number since it is divisible by the number (88) 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 809399448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1299916800).

809399448 is an abundant number, since it is smaller than the sum of its proper divisors (1790434152).

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

809399448 is a wasteful number, since it uses less digits than its factorization.

809399448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782 (or 775 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 54.

The square root of 809399448 is about 28449.9463619881. The cubic root of 809399448 is about 931.9393177042.

The spelling of 809399448 in words is "eight hundred nine million, three hundred ninety-nine thousand, four hundred forty-eight".