978165 has 12 divisors (see below), whose sum is σ = 1695564. Its totient is φ = 521664.

The previous prime is 978157. The next prime is 978179. The reversal of 978165 is 561879.

It can be written as a sum of positive squares in 2 ways, for example, as 178929 + 799236 = 423^2 + 894^2 .

It is not a de Polignac number, because 978165 - 2³ = 978157 is a prime.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10824 + ... + 10913.

It is an arithmetic number, because the mean of its divisors is an integer number (141297).

2⁹⁷⁸¹⁶⁵ is an apocalyptic number.

It is an amenable number.

978165 is a deficient number, since it is larger than the sum of its proper divisors (717399).

978165 is a wasteful number, since it uses less digits than its factorization.

978165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21748 (or 21745 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 978165 is about 989.0222444414. The cubic root of 978165 is about 99.2668040418.

The spelling of 978165 in words is "nine hundred seventy-eight thousand, one hundred sixty-five".