978659 has 4 divisors (see below), whose sum is σ = 1067640. Its totient is φ = 889680.

The previous prime is 978647. The next prime is 978683. The reversal of 978659 is 956879.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 978659 - 2⁴ = 978643 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 978659.

It is not an unprimeable number, because it can be changed into a prime (978619) 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, 44474 + ... + 44495.

It is an arithmetic number, because the mean of its divisors is an integer number (266910).

2⁹⁷⁸⁶⁵⁹ is an apocalyptic number.

978659 is a deficient number, since it is larger than the sum of its proper divisors (88981).

978659 is a wasteful number, since it uses less digits than its factorization.

978659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88980.

The product of its digits is 136080, while the sum is 44.

The square root of 978659 is about 989.2719545201. The cubic root of 978659 is about 99.2835120438.

The spelling of 978659 in words is "nine hundred seventy-eight thousand, six hundred fifty-nine".