978505 has 8 divisors (see below), whose sum is σ = 1281024. Its totient is φ = 711600.

The previous prime is 978491. The next prime is 978511. The reversal of 978505 is 505879.

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

It is not a de Polignac number, because 978505 - 2⁵ = 978473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8841 + ... + 8950.

It is an arithmetic number, because the mean of its divisors is an integer number (160128).

2⁹⁷⁸⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

978505 is a deficient number, since it is larger than the sum of its proper divisors (302519).

978505 is a wasteful number, since it uses less digits than its factorization.

978505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17807.

The product of its (nonzero) digits is 12600, while the sum is 34.

The square root of 978505 is about 989.1941164402. The cubic root of 978505 is about 99.2783040797.

The spelling of 978505 in words is "nine hundred seventy-eight thousand, five hundred five".