809712 has 30 divisors (see below), whose sum is σ = 2266472. Its totient is φ = 269856.

The previous prime is 809707. The next prime is 809719. The reversal of 809712 is 217908.

809712 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809719) by changing a digit.

809712 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2668 + ... + 2955.

2⁸⁰⁹⁷¹² is an apocalyptic number.

It is an amenable number.

809712 is an abundant number, since it is smaller than the sum of its proper divisors (1456760).

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

809712 is a wasteful number, since it uses less digits than its factorization.

809712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5637 (or 5628 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 809712 is about 899.8399857752. The cubic root of 809712 is about 93.2059259312.

It can be divided in two parts, 809 and 712, that added together give a square (1521 = 39²).

The spelling of 809712 in words is "eight hundred nine thousand, seven hundred twelve".