978605 has 16 divisors (see below), whose sum is σ = 1289520. Its totient is φ = 709632.

The previous prime is 978599. The next prime is 978611. The reversal of 978605 is 506879.

It is an interprime number because it is at equal distance from previous prime (978599) and next prime (978611).

It can be written as a sum of positive squares in 8 ways, for example, as 29929 + 948676 = 173^2 + 974^2 .

It is a cyclic number.

It is not a de Polignac number, because 978605 - 2⁶ = 978541 is a prime.

It is a super-3 number, since 3×978605³ = 2811535333796385375, which contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2267 + ... + 2663.

It is an arithmetic number, because the mean of its divisors is an integer number (80595).

2⁹⁷⁸⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

978605 is a deficient number, since it is larger than the sum of its proper divisors (310915).

978605 is a wasteful number, since it uses less digits than its factorization.

978605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 978605 is about 989.2446613452. The cubic root of 978605 is about 99.2816859368.

The spelling of 978605 in words is "nine hundred seventy-eight thousand, six hundred five".