726438305 has 16 divisors (see below), whose sum is σ = 971585280. Its totient is φ = 518176512.

The previous prime is 726438289. The next prime is 726438319. The reversal of 726438305 is 503834627.

It is not a de Polignac number, because 726438305 - 2⁴ = 726438289 is a prime.

It is a super-2 number, since 2×726438305² = 1055425221942546050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 223289 + ... + 226518.

It is an arithmetic number, because the mean of its divisors is an integer number (60724080).

Almost surely, 2^726438305 is an apocalyptic number.

It is an amenable number.

726438305 is a deficient number, since it is larger than the sum of its proper divisors (245146975).

726438305 is a wasteful number, since it uses less digits than its factorization.

726438305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449848.

The product of its (nonzero) digits is 120960, while the sum is 38.

The square root of 726438305 is about 26952.5194555166. The cubic root of 726438305 is about 898.9445673015.

The spelling of 726438305 in words is "seven hundred twenty-six million, four hundred thirty-eight thousand, three hundred five".