726513 has 4 divisors (see below), whose sum is σ = 968688. Its totient is φ = 484340.

The previous prime is 726497. The next prime is 726521. The reversal of 726513 is 315627.

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 726513 - 2⁴ = 726497 is a prime.

It is a super-2 number, since 2×726513² = 1055642278338, which contains 22 as substring.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (726533) 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, 121083 + ... + 121088.

It is an arithmetic number, because the mean of its divisors is an integer number (242172).

2⁷²⁶⁵¹³ is an apocalyptic number.

It is an amenable number.

726513 is a deficient number, since it is larger than the sum of its proper divisors (242175).

726513 is a wasteful number, since it uses less digits than its factorization.

726513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242174.

The product of its digits is 1260, while the sum is 24.

The square root of 726513 is about 852.3573194383. The cubic root of 726513 is about 89.8975377150.

The spelling of 726513 in words is "seven hundred twenty-six thousand, five hundred thirteen".