726731 has 8 divisors (see below), whose sum is σ = 798720. Its totient is φ = 658152.

The previous prime is 726707. The next prime is 726751. The reversal of 726731 is 137627.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 726731 - 2¹⁸ = 464587 is a prime.

It is a super-2 number, since 2×726731² = 1056275892722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 726731.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 726731.

It is not an unprimeable number, because it can be changed into a prime (726701) 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 7 ways as a sum of consecutive naturals, for example, 395 + ... + 1268.

It is an arithmetic number, because the mean of its divisors is an integer number (99840).

2⁷²⁶⁷³¹ is an apocalyptic number.

726731 is a deficient number, since it is larger than the sum of its proper divisors (71989).

726731 is a wasteful number, since it uses less digits than its factorization.

726731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1705.

The product of its digits is 1764, while the sum is 26.

The square root of 726731 is about 852.4851904872. The cubic root of 726731 is about 89.9065284710.

The spelling of 726731 in words is "seven hundred twenty-six thousand, seven hundred thirty-one".