888721 has 2 divisors, whose sum is σ = 888722. Its totient is φ = 888720.

The previous prime is 888691. The next prime is 888737. The reversal of 888721 is 127888.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 819025 + 69696 = 905^2 + 264^2 .

It is a cyclic number.

It is not a de Polignac number, because 888721 - 2⁵ = 888689 is a prime.

888721 is a lucky number.

It is a plaindrome in base 11.

It is a nialpdrome in base 10.

It is not a weakly prime, because it can be changed into another prime (888751) 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 as a sum of consecutive naturals, namely, 444360 + 444361.

It is an arithmetic number, because the mean of its divisors is an integer number (444361).

2⁸⁸⁸⁷²¹ is an apocalyptic number.

It is an amenable number.

888721 is a deficient number, since it is larger than the sum of its proper divisors (1).

888721 is an equidigital number, since it uses as much as digits as its factorization.

888721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7168, while the sum is 34.

The square root of 888721 is about 942.7200008486. The cubic root of 888721 is about 96.1439175307.

The spelling of 888721 in words is "eight hundred eighty-eight thousand, seven hundred twenty-one".