8838721 has 4 divisors (see below), whose sum is σ = 8849092. Its totient is φ = 8828352.

The previous prime is 8838677. The next prime is 8838727. The reversal of 8838721 is 1278388.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2890000 + 5948721 = 1700^2 + 2439^2 .

It is a cyclic number.

It is not a de Polignac number, because 8838721 - 2¹⁷ = 8707649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8838727) by changing a digit.

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, 3780 + ... + 5653.

It is an arithmetic number, because the mean of its divisors is an integer number (2212273).

Almost surely, 2^8838721 is an apocalyptic number.

It is an amenable number.

8838721 is a deficient number, since it is larger than the sum of its proper divisors (10371).

8838721 is an equidigital number, since it uses as much as digits as its factorization.

8838721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10370.

The product of its digits is 21504, while the sum is 37.

The square root of 8838721 is about 2972.9986545574. The cubic root of 8838721 is about 206.7583900285.

It can be divided in two parts, 8838 and 721, that added together give a palindrome (9559).

The spelling of 8838721 in words is "eight million, eight hundred thirty-eight thousand, seven hundred twenty-one".