978587 has 6 divisors (see below), whose sum is σ = 1002108. Its totient is φ = 955604.

The previous prime is 978569. The next prime is 978599. The reversal of 978587 is 785879.

It is a de Polignac number, because none of the positive numbers 2^k-978587 is a prime.

It is a Duffinian number.

Its product of digits (141120) is a multiple of the sum of its prime divisors (490).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 978587.

It is not an unprimeable number, because it can be changed into a prime (978287) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1988 + ... + 2430.

It is an arithmetic number, because the mean of its divisors is an integer number (167018).

2⁹⁷⁸⁵⁸⁷ is an apocalyptic number.

978587 is a deficient number, since it is larger than the sum of its proper divisors (23521).

978587 is an equidigital number, since it uses as much as digits as its factorization.

978587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537 (or 490 counting only the distinct ones).

The product of its digits is 141120, while the sum is 44.

The square root of 978587 is about 989.2355634529. The cubic root of 978587 is about 99.2810772195.

The spelling of 978587 in words is "nine hundred seventy-eight thousand, five hundred eighty-seven".