197978 has 8 divisors (see below), whose sum is σ = 324000. Its totient is φ = 89980.

The previous prime is 197971. The next prime is 198013. The reversal of 197978 is 879791.

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

It is not an unprimeable number, because it can be changed into a prime (197971) by changing a digit.

197978 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4478 + ... + 4521.

It is an arithmetic number, because the mean of its divisors is an integer number (40500).

2¹⁹⁷⁹⁷⁸ is an apocalyptic number.

197978 is a deficient number, since it is larger than the sum of its proper divisors (126022).

197978 is a wasteful number, since it uses less digits than its factorization.

197978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9012.

The product of its digits is 31752, while the sum is 41.

The square root of 197978 is about 444.9471878774. The cubic root of 197978 is about 58.2826080575.

It can be divided in two parts, 19 and 7978, that added together give a palindrome (7997).

The spelling of 197978 in words is "one hundred ninety-seven thousand, nine hundred seventy-eight".