726591 has 4 divisors (see below), whose sum is σ = 968792. Its totient is φ = 484392.

The previous prime is 726589. The next prime is 726599. The reversal of 726591 is 195627.

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

It is not a de Polignac number, because 726591 - 2¹ = 726589 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726599) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121096 + ... + 121101.

It is an arithmetic number, because the mean of its divisors is an integer number (242198).

2⁷²⁶⁵⁹¹ is an apocalyptic number.

726591 is a deficient number, since it is larger than the sum of its proper divisors (242201).

726591 is a wasteful number, since it uses less digits than its factorization.

726591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242200.

The product of its digits is 3780, while the sum is 30.

The square root of 726591 is about 852.4030736688. The cubic root of 726591 is about 89.9007547976.

It can be divided in two parts, 72 and 6591, that multiplied together give a cube (474552 = 78³).

The spelling of 726591 in words is "seven hundred twenty-six thousand, five hundred ninety-one".