726493909 has 4 divisors (see below), whose sum is σ = 733687020. Its totient is φ = 719300800.

The previous prime is 726493907. The next prime is 726493913. The reversal of 726493909 is 909394627.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 712729809 + 13764100 = 26697^2 + 3710^2 .

It is a cyclic number.

It is not a de Polignac number, because 726493909 - 2¹ = 726493907 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726493907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3596404 + ... + 3596605.

It is an arithmetic number, because the mean of its divisors is an integer number (183421755).

Almost surely, 2^726493909 is an apocalyptic number.

It is an amenable number.

726493909 is a deficient number, since it is larger than the sum of its proper divisors (7193111).

726493909 is a wasteful number, since it uses less digits than its factorization.

726493909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7193110.

The product of its (nonzero) digits is 734832, while the sum is 49.

The square root of 726493909 is about 26953.5509534458. The cubic root of 726493909 is about 898.9675027837.

The spelling of 726493909 in words is "seven hundred twenty-six million, four hundred ninety-three thousand, nine hundred nine".