1978163 has 4 divisors (see below), whose sum is σ = 2158008. Its totient is φ = 1798320.

The previous prime is 1978159. The next prime is 1978181. The reversal of 1978163 is 3618791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3618791 = 11 ⋅328981.

It is a cyclic number.

It is not a de Polignac number, because 1978163 - 2² = 1978159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1978153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89906 + ... + 89927.

It is an arithmetic number, because the mean of its divisors is an integer number (539502).

2^1978163 is an apocalyptic number.

1978163 is a deficient number, since it is larger than the sum of its proper divisors (179845).

1978163 is a wasteful number, since it uses less digits than its factorization.

1978163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179844.

The product of its digits is 9072, while the sum is 35.

The square root of 1978163 is about 1406.4718269486. The cubic root of 1978163 is about 125.5318776395.

The spelling of 1978163 in words is "one million, nine hundred seventy-eight thousand, one hundred sixty-three".