978985 has 16 divisors (see below), whose sum is σ = 1362816. Its totient is φ = 661248.

The previous prime is 978973. The next prime is 978997. The reversal of 978985 is 589879.

978985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (978973) and next prime (978997).

It is not a de Polignac number, because 978985 - 2⁹ = 978473 is a prime.

Its product of digits (181440) is a multiple of the sum of its prime divisors (432).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2737 + ... + 3073.

It is an arithmetic number, because the mean of its divisors is an integer number (85176).

2⁹⁷⁸⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

978985 is a deficient number, since it is larger than the sum of its proper divisors (383831).

978985 is a wasteful number, since it uses less digits than its factorization.

978985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432.

The product of its digits is 181440, while the sum is 46.

The square root of 978985 is about 989.4367084357. The cubic root of 978985 is about 99.2945348930.

It can be divided in two parts, 97898 and 5, that added together give a triangular number (97903 = T₄₄₂).

The spelling of 978985 in words is "nine hundred seventy-eight thousand, nine hundred eighty-five".