726745 has 4 divisors (see below), whose sum is σ = 872100. Its totient is φ = 581392.

The previous prime is 726707. The next prime is 726751. The reversal of 726745 is 547627.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 238144 + 488601 = 488^2 + 699^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-726745 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 3 ways as a sum of consecutive naturals, for example, 72670 + ... + 72679.

It is an arithmetic number, because the mean of its divisors is an integer number (218025).

2⁷²⁶⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

726745 is a deficient number, since it is larger than the sum of its proper divisors (145355).

726745 is a wasteful number, since it uses less digits than its factorization.

726745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145354.

The product of its digits is 11760, while the sum is 31.

The square root of 726745 is about 852.4934017340. The cubic root of 726745 is about 89.9071057976.

The spelling of 726745 in words is "seven hundred twenty-six thousand, seven hundred forty-five".