726217 has 4 divisors (see below), whose sum is σ = 727936. Its totient is φ = 724500.

The previous prime is 726191. The next prime is 726221. The reversal of 726217 is 712627.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 712627 = 71 ⋅10037.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-726217 is a prime.

It is a super-2 number, since 2×726217² = 1054782262178, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 726191 and 726200.

It is not an unprimeable number, because it can be changed into a prime (726287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268 + ... + 1234.

It is an arithmetic number, because the mean of its divisors is an integer number (181984).

2⁷²⁶²¹⁷ is an apocalyptic number.

It is an amenable number.

726217 is a deficient number, since it is larger than the sum of its proper divisors (1719).

726217 is an equidigital number, since it uses as much as digits as its factorization.

726217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1718.

The product of its digits is 1176, while the sum is 25.

The square root of 726217 is about 852.1836656496. The cubic root of 726217 is about 89.8853272036.

The spelling of 726217 in words is "seven hundred twenty-six thousand, two hundred seventeen".