163979638 has 8 divisors (see below), whose sum is σ = 247442832. Its totient is φ = 81498696.

The previous prime is 163979617. The next prime is 163979639. The reversal of 163979638 is 836979361.

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

It is a super-2 number, since 2×163979638² = 53778643357222088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163979639) 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, 245145 + ... + 245812.

It is an arithmetic number, because the mean of its divisors is an integer number (30930354).

Almost surely, 2^163979638 is an apocalyptic number.

163979638 is a deficient number, since it is larger than the sum of its proper divisors (83463194).

163979638 is a wasteful number, since it uses less digits than its factorization.

163979638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491126.

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

The square root of 163979638 is about 12805.4534476527. The cubic root of 163979638 is about 547.3477129743.

The spelling of 163979638 in words is "one hundred sixty-three million, nine hundred seventy-nine thousand, six hundred thirty-eight".