988921 has 4 divisors (see below), whose sum is σ = 995152. Its totient is φ = 982692.

The previous prime is 988909. The next prime is 988937. The reversal of 988921 is 129889.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 129889 = 193 ⋅673.

It is a cyclic number.

It is not a de Polignac number, because 988921 - 2⁹ = 988409 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (988901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2871 + ... + 3196.

It is an arithmetic number, because the mean of its divisors is an integer number (248788).

2⁹⁸⁸⁹²¹ is an apocalyptic number.

It is an amenable number.

988921 is a deficient number, since it is larger than the sum of its proper divisors (6231).

988921 is a wasteful number, since it uses less digits than its factorization.

988921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6230.

The product of its digits is 10368, while the sum is 37.

The square root of 988921 is about 994.4450713840. The cubic root of 988921 is about 99.6293277182.

The spelling of 988921 in words is "nine hundred eighty-eight thousand, nine hundred twenty-one".