726491 has 4 divisors (see below), whose sum is σ = 731112. Its totient is φ = 721872.

The previous prime is 726487. The next prime is 726497. The reversal of 726491 is 194627.

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

It is a cyclic number.

It is not a de Polignac number, because 726491 - 2² = 726487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (726497) 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, 2066 + ... + 2391.

It is an arithmetic number, because the mean of its divisors is an integer number (182778).

2⁷²⁶⁴⁹¹ is an apocalyptic number.

726491 is a deficient number, since it is larger than the sum of its proper divisors (4621).

726491 is a wasteful number, since it uses less digits than its factorization.

726491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4620.

The product of its digits is 3024, while the sum is 29.

The square root of 726491 is about 852.3444139548. The cubic root of 726491 is about 89.8966302911.

The spelling of 726491 in words is "seven hundred twenty-six thousand, four hundred ninety-one".