888821 has 4 divisors (see below), whose sum is σ = 919500. Its totient is φ = 858144.

The previous prime is 888809. The next prime is 888827. The reversal of 888821 is 128888.

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 184900 + 703921 = 430^2 + 839^2 .

It is a cyclic number.

It is not a de Polignac number, because 888821 - 2¹⁴ = 872437 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a nialpdrome in base 10.

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 888821.

It is not an unprimeable number, because it can be changed into a prime (888827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15296 + ... + 15353.

It is an arithmetic number, because the mean of its divisors is an integer number (229875).

2⁸⁸⁸⁸²¹ is an apocalyptic number.

It is an amenable number.

888821 is a deficient number, since it is larger than the sum of its proper divisors (30679).

888821 is a wasteful number, since it uses less digits than its factorization.

888821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30678.

The product of its digits is 8192, while the sum is 35.

The square root of 888821 is about 942.7730373743. The cubic root of 888821 is about 96.1475234735.

The spelling of 888821 in words is "eight hundred eighty-eight thousand, eight hundred twenty-one".