197878 has 4 divisors (see below), whose sum is σ = 296820. Its totient is φ = 98938.

The previous prime is 197837. The next prime is 197887. The reversal of 197878 is 878791.

197878 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 197878.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49468 + ... + 49471.

It is an arithmetic number, because the mean of its divisors is an integer number (74205).

2¹⁹⁷⁸⁷⁸ is an apocalyptic number.

197878 is a deficient number, since it is larger than the sum of its proper divisors (98942).

197878 is an equidigital number, since it uses as much as digits as its factorization.

197878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98941.

The product of its digits is 28224, while the sum is 40.

The square root of 197878 is about 444.8348007969. The cubic root of 197878 is about 58.2727934276.

It can be divided in two parts, 1 and 97878, that added together give a palindrome (97879).

The spelling of 197878 in words is "one hundred ninety-seven thousand, eight hundred seventy-eight".