726389 has 4 divisors (see below), whose sum is σ = 764640. Its totient is φ = 688140.

The previous prime is 726379. The next prime is 726391. The reversal of 726389 is 983627.

726389 is nontrivially palindromic in base 15.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 726389 - 2¹⁶ = 660853 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726379) by changing a digit.

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, 19097 + ... + 19134.

It is an arithmetic number, because the mean of its divisors is an integer number (191160).

2⁷²⁶³⁸⁹ is an apocalyptic number.

It is an amenable number.

726389 is a deficient number, since it is larger than the sum of its proper divisors (38251).

726389 is a wasteful number, since it uses less digits than its factorization.

726389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38250.

The product of its digits is 18144, while the sum is 35.

The square root of 726389 is about 852.2845768873. The cubic root of 726389 is about 89.8924229045.

The spelling of 726389 in words is "seven hundred twenty-six thousand, three hundred eighty-nine".