44721 has 6 divisors (see below), whose sum is σ = 64610. Its totient is φ = 29808.

The previous prime is 44711. The next prime is 44729. The reversal of 44721 is 12744.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 32400 + 12321 = 180^2 + 111^2 .

It is not a de Polignac number, because 44721 - 2⁶ = 44657 is a prime.

It is a Duffinian number.

It is a Curzon number.

44721 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 44694 and 44703.

It is not an unprimeable number, because it can be changed into a prime (44729) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2476 + ... + 2493.

2⁴⁴⁷²¹ is an apocalyptic number.

It is an amenable number.

44721 is a deficient number, since it is larger than the sum of its proper divisors (19889).

44721 is a wasteful number, since it uses less digits than its factorization.

44721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4975 (or 4972 counting only the distinct ones).

The product of its digits is 224, while the sum is 18.

The square root of 44721 is about 211.4734025829. The cubic root of 44721 is about 35.4952714723.

The spelling of 44721 in words is "forty-four thousand, seven hundred twenty-one", and thus it is an iban number.