9978163 has 4 divisors (see below), whose sum is σ = 10745728. Its totient is φ = 9210600.

The previous prime is 9978131. The next prime is 9978169. The reversal of 9978163 is 3618799.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3618799 = 71 ⋅50969.

It is a cyclic number.

It is not a de Polignac number, because 9978163 - 2⁵ = 9978131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9978169) 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, 383763 + ... + 383788.

It is an arithmetic number, because the mean of its divisors is an integer number (2686432).

Almost surely, 2^9978163 is an apocalyptic number.

9978163 is a deficient number, since it is larger than the sum of its proper divisors (767565).

9978163 is a wasteful number, since it uses less digits than its factorization.

9978163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 767564.

The product of its digits is 81648, while the sum is 43.

The square root of 9978163 is about 3158.8230403111. The cubic root of 9978163 is about 215.2865334132.

The spelling of 9978163 in words is "nine million, nine hundred seventy-eight thousand, one hundred sixty-three".