721941 has 16 divisors (see below), whose sum is σ = 1064448. Its totient is φ = 431600.

The previous prime is 721921. The next prime is 721951. The reversal of 721941 is 149127.

It is a cyclic number.

It is not a de Polignac number, because 721941 - 2⁵ = 721909 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 721941.

It is not an unprimeable number, because it can be changed into a prime (721921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4240 + ... + 4406.

It is an arithmetic number, because the mean of its divisors is an integer number (66528).

2⁷²¹⁹⁴¹ is an apocalyptic number.

It is an amenable number.

721941 is a deficient number, since it is larger than the sum of its proper divisors (342507).

721941 is a wasteful number, since it uses less digits than its factorization.

721941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312.

The product of its digits is 504, while the sum is 24.

The square root of 721941 is about 849.6711128431. The cubic root of 721941 is about 89.7085634665.

It can be divided in two parts, 7219 and 41, that added together give a triangular number (7260 = T₁₂₀).

The spelling of 721941 in words is "seven hundred twenty-one thousand, nine hundred forty-one".