978705 has 48 divisors (see below), whose sum is σ = 2096640. Its totient is φ = 411264.

The previous prime is 978697. The next prime is 978713. The reversal of 978705 is 507879.

It is an interprime number because it is at equal distance from previous prime (978697) and next prime (978713).

It is not a de Polignac number, because 978705 - 2³ = 978697 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 978705.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3976 + ... + 4214.

It is an arithmetic number, because the mean of its divisors is an integer number (43680).

2⁹⁷⁸⁷⁰⁵ is an apocalyptic number.

It is an amenable number.

978705 is an abundant number, since it is smaller than the sum of its proper divisors (1117935).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

978705 is a wasteful number, since it uses less digits than its factorization.

978705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270 (or 267 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 36.

The square root of 978705 is about 989.2952036677. The cubic root of 978705 is about 99.2850675635.

The spelling of 978705 in words is "nine hundred seventy-eight thousand, seven hundred five".