978887 has 16 divisors (see below), whose sum is σ = 1247232. Its totient is φ = 747360.

The previous prime is 978883. The next prime is 978907. The reversal of 978887 is 788879.

It is a cyclic number.

It is not a de Polignac number, because 978887 - 2² = 978883 is a prime.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 2648 + ... + 2994.

It is an arithmetic number, because the mean of its divisors is an integer number (77952).

2⁹⁷⁸⁸⁸⁷ is an apocalyptic number.

978887 is a deficient number, since it is larger than the sum of its proper divisors (268345).

978887 is a wasteful number, since it uses less digits than its factorization.

978887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398.

The product of its digits is 225792, while the sum is 47.

The square root of 978887 is about 989.3871840690. The cubic root of 978887 is about 99.2912215331.

The spelling of 978887 in words is "nine hundred seventy-eight thousand, eight hundred eighty-seven".