726009 has 16 divisors (see below), whose sum is σ = 1044480. Its totient is φ = 447120.

The previous prime is 726007. The next prime is 726013. The reversal of 726009 is 900627.

It is not a de Polignac number, because 726009 - 2¹ = 726007 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 726009.

It is not an unprimeable number, because it can be changed into a prime (726007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2544 + ... + 2814.

It is an arithmetic number, because the mean of its divisors is an integer number (65280).

2⁷²⁶⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

726009 is a deficient number, since it is larger than the sum of its proper divisors (318471).

726009 is a wasteful number, since it uses less digits than its factorization.

726009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340.

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 726009 is about 852.0616174902. The cubic root of 726009 is about 89.8767448592.

The spelling of 726009 in words is "seven hundred twenty-six thousand, nine".