196778 has 4 divisors (see below), whose sum is σ = 295170. Its totient is φ = 98388.

The previous prime is 196771. The next prime is 196799. The reversal of 196778 is 877691.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 877691 = 433 ⋅2027.

It can be written as a sum of positive squares in only one way, i.e., 196249 + 529 = 443^2 + 23^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (196771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49193 + ... + 49196.

2¹⁹⁶⁷⁷⁸ is an apocalyptic number.

196778 is a deficient number, since it is larger than the sum of its proper divisors (98392).

196778 is an equidigital number, since it uses as much as digits as its factorization.

196778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98391.

The product of its digits is 21168, while the sum is 38.

The square root of 196778 is about 443.5966636484. The cubic root of 196778 is about 58.1646136098.

The spelling of 196778 in words is "one hundred ninety-six thousand, seven hundred seventy-eight".