726391 has 2 divisors, whose sum is σ = 726392. Its totient is φ = 726390.

The previous prime is 726379. The next prime is 726413. The reversal of 726391 is 193627.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 726391 - 2¹⁷ = 595319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (726301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 363195 + 363196.

It is an arithmetic number, because the mean of its divisors is an integer number (363196).

2⁷²⁶³⁹¹ is an apocalyptic number.

726391 is a deficient number, since it is larger than the sum of its proper divisors (1).

726391 is an equidigital number, since it uses as much as digits as its factorization.

726391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2268, while the sum is 28.

The square root of 726391 is about 852.2857502035. The cubic root of 726391 is about 89.8925054061.

The spelling of 726391 in words is "seven hundred twenty-six thousand, three hundred ninety-one".