726442169 has 2 divisors, whose sum is σ = 726442170. Its totient is φ = 726442168.

The previous prime is 726442139. The next prime is 726442177. The reversal of 726442169 is 961244627.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 634032400 + 92409769 = 25180^2 + 9613^2 .

It is a cyclic number.

It is not a de Polignac number, because 726442169 - 2¹⁶ = 726376633 is a prime.

It is a super-2 number, since 2×726442169² = 1055436449802849122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (726442139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 363221084 + 363221085.

It is an arithmetic number, because the mean of its divisors is an integer number (363221085).

Almost surely, 2^726442169 is an apocalyptic number.

It is an amenable number.

726442169 is a deficient number, since it is larger than the sum of its proper divisors (1).

726442169 is an equidigital number, since it uses as much as digits as its factorization.

726442169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 41.

The square root of 726442169 is about 26952.5911370317. The cubic root of 726442169 is about 898.9461611582.

The spelling of 726442169 in words is "seven hundred twenty-six million, four hundred forty-two thousand, one hundred sixty-nine".