163863979 has 4 divisors (see below), whose sum is σ = 163889584. Its totient is φ = 163838376.

The previous prime is 163863941. The next prime is 163863989. The reversal of 163863979 is 979368361.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 163863979 - 2¹⁵ = 163831211 is a prime.

It is a super-2 number, since 2×163863979² = 53702807227424882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163863989) 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, 6154 + ... + 19120.

It is an arithmetic number, because the mean of its divisors is an integer number (40972396).

Almost surely, 2^163863979 is an apocalyptic number.

163863979 is a deficient number, since it is larger than the sum of its proper divisors (25605).

163863979 is a wasteful number, since it uses less digits than its factorization.

163863979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25604.

The product of its digits is 1469664, while the sum is 52.

The square root of 163863979 is about 12800.9366454178. The cubic root of 163863979 is about 547.2189966299.

The spelling of 163863979 in words is "one hundred sixty-three million, eight hundred sixty-three thousand, nine hundred seventy-nine".