726646 has 8 divisors (see below), whose sum is σ = 1093824. Its totient is φ = 362040.

The previous prime is 726641. The next prime is 726647. The reversal of 726646 is 646627.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726641) by changing a digit.

726646 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 411 + ... + 1273.

It is an arithmetic number, because the mean of its divisors is an integer number (136728).

2⁷²⁶⁶⁴⁶ is an apocalyptic number.

726646 is a deficient number, since it is larger than the sum of its proper divisors (367178).

726646 is a wasteful number, since it uses less digits than its factorization.

726646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286.

The product of its digits is 12096, while the sum is 31.

The square root of 726646 is about 852.4353347909. The cubic root of 726646 is about 89.9030231149.

Subtracting from 726646 its sum of digits (31), we obtain a triangular number (726615 = T₁₂₀₅).

It can be divided in two parts, 726 and 646, that multiplied together give a triangular number (468996 = T₉₆₈).

The spelling of 726646 in words is "seven hundred twenty-six thousand, six hundred forty-six".