163978 has 8 divisors (see below), whose sum is σ = 247968. Its totient is φ = 81324.

The previous prime is 163973. The next prime is 163979. The reversal of 163978 is 879361.

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

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (163973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75 + ... + 577.

It is an arithmetic number, because the mean of its divisors is an integer number (30996).

2¹⁶³⁹⁷⁸ is an apocalyptic number.

163978 is a deficient number, since it is larger than the sum of its proper divisors (83990).

163978 is a wasteful number, since it uses less digits than its factorization.

163978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668.

The product of its digits is 9072, while the sum is 34.

The square root of 163978 is about 404.9419711514. The cubic root of 163978 is about 54.7345890475.

The spelling of 163978 in words is "one hundred sixty-three thousand, nine hundred seventy-eight".