988821 has 16 divisors (see below), whose sum is σ = 1494720. Its totient is φ = 645840.

The previous prime is 988789. The next prime is 988829. The reversal of 988821 is 128889.

It is not a de Polignac number, because 988821 - 2⁵ = 988789 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (988829) 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 15 ways as a sum of consecutive naturals, for example, 1086 + ... + 1776.

It is an arithmetic number, because the mean of its divisors is an integer number (93420).

2⁹⁸⁸⁸²¹ is an apocalyptic number.

It is an amenable number.

988821 is a deficient number, since it is larger than the sum of its proper divisors (505899).

988821 is a wasteful number, since it uses less digits than its factorization.

988821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 753 (or 747 counting only the distinct ones).

The product of its digits is 9216, while the sum is 36.

The square root of 988821 is about 994.3947908150. The cubic root of 988821 is about 99.6259694222.

The spelling of 988821 in words is "nine hundred eighty-eight thousand, eight hundred twenty-one".