988889 has 4 divisors (see below), whose sum is σ = 1078800.
Its totient is φ = 898980.
The previous prime is 988877. The next prime is 988901.
988889 is nontrivially palindromic in base 10.
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.
It is an interprime number because it is at equal distance from previous prime (988877) and next prime (988901).
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-988889 is a prime.
It is a Duffinian number.
It is a Curzon number.
It is not an unprimeable number, because it can be changed into a prime (988829) 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, 44939 + ... + 44960.
It is an arithmetic number, because the mean of its divisors is an integer number (269700).
2988889 is an apocalyptic number.
It is an amenable number.
988889 is a deficient number, since it is larger than the sum of its proper divisors (89911).
988889 is a wasteful number, since it uses less digits than its factorization.
988889 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 89910.
The product of its digits is 331776, while the sum is 50.
The square root of 988889 is about 994.4289818785.
The cubic root of 988889 is about 99.6282530881.
The spelling of 988889 in words is "nine hundred eighty-eight thousand, eight hundred eighty-nine".