726921 has 32 divisors (see below), whose sum is σ = 1232000. Its totient is φ = 419904.

The previous prime is 726917. The next prime is 726923. The reversal of 726921 is 129627.

726921 = 16³ + 17³ + ... + 41³.

726921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 726921 - 2² = 726917 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (726923) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6615 + ... + 6723.

It is an arithmetic number, because the mean of its divisors is an integer number (38500).

2⁷²⁶⁹²¹ is an apocalyptic number.

It is an amenable number.

726921 is a deficient number, since it is larger than the sum of its proper divisors (505079).

726921 is a wasteful number, since it uses less digits than its factorization.

726921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150 (or 144 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 726921 is about 852.5966220904. The cubic root of 726921 is about 89.9143629848.

The spelling of 726921 in words is "seven hundred twenty-six thousand, nine hundred twenty-one".