8721726 has 32 divisors (see below), whose sum is σ = 19396608. Its totient is φ = 2596320.

The previous prime is 8721701. The next prime is 8721737. The reversal of 8721726 is 6271278.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 615 + ... + 4221.

It is an arithmetic number, because the mean of its divisors is an integer number (606144).

Almost surely, 2^8721726 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8721726, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9698304).

8721726 is an abundant number, since it is smaller than the sum of its proper divisors (10674882).

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

8721726 is a wasteful number, since it uses less digits than its factorization.

8721726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3656.

The product of its digits is 9408, while the sum is 33.

The square root of 8721726 is about 2953.2568462631. The cubic root of 8721726 is about 205.8420726928.

The spelling of 8721726 in words is "eight million, seven hundred twenty-one thousand, seven hundred twenty-six".