978889 has 4 divisors (see below), whose sum is σ = 991360. Its totient is φ = 966420.

The previous prime is 978883. The next prime is 978907. The reversal of 978889 is 988879.

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 a cyclic number.

It is not a de Polignac number, because 978889 - 2¹⁷ = 847817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (978883) 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, 6117 + ... + 6274.

It is an arithmetic number, because the mean of its divisors is an integer number (247840).

2⁹⁷⁸⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

978889 is a deficient number, since it is larger than the sum of its proper divisors (12471).

978889 is a wasteful number, since it uses less digits than its factorization.

978889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12470.

The product of its digits is 290304, while the sum is 49.

The square root of 978889 is about 989.3881947951. The cubic root of 978889 is about 99.2912891549.

The spelling of 978889 in words is "nine hundred seventy-eight thousand, eight hundred eighty-nine".