726665 has 16 divisors (see below), whose sum is σ = 943488. Its totient is φ = 535296.

The previous prime is 726659. The next prime is 726679. The reversal of 726665 is 566627.

It is not a de Polignac number, because 726665 - 2⁶ = 726601 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7004 + ... + 7106.

It is an arithmetic number, because the mean of its divisors is an integer number (58968).

2⁷²⁶⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

726665 is a deficient number, since it is larger than the sum of its proper divisors (216823).

726665 is a wasteful number, since it uses less digits than its factorization.

726665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208.

The product of its digits is 15120, while the sum is 32.

The square root of 726665 is about 852.4464792584. The cubic root of 726665 is about 89.9038066888.

The spelling of 726665 in words is "seven hundred twenty-six thousand, six hundred sixty-five".