978989 has 8 divisors (see below), whose sum is σ = 1086240. Its totient is φ = 874800.

The previous prime is 978973. The next prime is 978997. The reversal of 978989 is 989879.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 978989 - 2⁴ = 978973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978389) 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 7 ways as a sum of consecutive naturals, for example, 59 + ... + 1400.

It is an arithmetic number, because the mean of its divisors is an integer number (135780).

2⁹⁷⁸⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

978989 is a deficient number, since it is larger than the sum of its proper divisors (107251).

978989 is a wasteful number, since it uses less digits than its factorization.

978989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1531.

The product of its digits is 326592, while the sum is 50.

The square root of 978989 is about 989.4387297857. The cubic root of 978989 is about 99.2946701275.

The spelling of 978989 in words is "nine hundred seventy-eight thousand, nine hundred eighty-nine".