163878979 has 8 divisors (see below), whose sum is σ = 186550272. Its totient is φ = 142503240.

The previous prime is 163878973. The next prime is 163878983. The reversal of 163878979 is 979878361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 163878979 - 2⁵ = 163878947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163878973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 323619 + ... + 324124.

It is an arithmetic number, because the mean of its divisors is an integer number (23318784).

Almost surely, 2^163878979 is an apocalyptic number.

163878979 is a deficient number, since it is larger than the sum of its proper divisors (22671293).

163878979 is a wasteful number, since it uses less digits than its factorization.

163878979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647777.

The product of its digits is 4572288, while the sum is 58.

The square root of 163878979 is about 12801.5225266372. The cubic root of 163878979 is about 547.2356934752.

The spelling of 163878979 in words is "one hundred sixty-three million, eight hundred seventy-eight thousand, nine hundred seventy-nine".