8721441 has 6 divisors (see below), whose sum is σ = 12597650. Its totient is φ = 5814288.

The previous prime is 8721413. The next prime is 8721443. The reversal of 8721441 is 1441278.

It can be written as a sum of positive squares in only one way, i.e., 8643600 + 77841 = 2940^2 + 279^2 .

It is not a de Polignac number, because 8721441 - 2⁷ = 8721313 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8721443) 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 5 ways as a sum of consecutive naturals, for example, 484516 + ... + 484533.

Almost surely, 2^8721441 is an apocalyptic number.

It is an amenable number.

8721441 is a deficient number, since it is larger than the sum of its proper divisors (3876209).

8721441 is a wasteful number, since it uses less digits than its factorization.

8721441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 969055 (or 969052 counting only the distinct ones).

The product of its digits is 1792, while the sum is 27.

The square root of 8721441 is about 2953.2085940549. The cubic root of 8721441 is about 205.8398305667.

It can be divided in two parts, 87 and 21441, that added together give a triangular number (21528 = T₂₀₇).

The spelling of 8721441 in words is "eight million, seven hundred twenty-one thousand, four hundred forty-one".