726641 has 2 divisors, whose sum is σ = 726642. Its totient is φ = 726640.

The previous prime is 726629. The next prime is 726647. The reversal of 726641 is 146627.

726641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 633616 + 93025 = 796^2 + 305^2 .

It is a cyclic number.

It is not a de Polignac number, because 726641 - 2¹⁴ = 710257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 726641.

It is not a weakly prime, because it can be changed into another prime (726647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 363320 + 363321.

It is an arithmetic number, because the mean of its divisors is an integer number (363321).

2⁷²⁶⁶⁴¹ is an apocalyptic number.

It is an amenable number.

726641 is a deficient number, since it is larger than the sum of its proper divisors (1).

726641 is an equidigital number, since it uses as much as digits as its factorization.

726641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 26.

The square root of 726641 is about 852.4324020120. The cubic root of 726641 is about 89.9028169090.

Subtracting from 726641 its sum of digits (26), we obtain a triangular number (726615 = T₁₂₀₅).

The spelling of 726641 in words is "seven hundred twenty-six thousand, six hundred forty-one".