196778919 has 8 divisors (see below), whose sum is σ = 262436992. Its totient is φ = 131153400.

The previous prime is 196778909. The next prime is 196778921. The reversal of 196778919 is 919877691.

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

It is not a de Polignac number, because 196778919 - 2⁴ = 196778903 is a prime.

It is a super-2 number, since 2×196778919² = 77443885925617122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (196778909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17592 + ... + 26514.

It is an arithmetic number, because the mean of its divisors is an integer number (32804624).

Almost surely, 2^196778919 is an apocalyptic number.

196778919 is a deficient number, since it is larger than the sum of its proper divisors (65658073).

196778919 is an equidigital number, since it uses as much as digits as its factorization.

196778919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16277.

The product of its digits is 1714608, while the sum is 57.

The square root of 196778919 is about 14027.7909522490. The cubic root of 196778919 is about 581.6470415716.

The spelling of 196778919 in words is "one hundred ninety-six million, seven hundred seventy-eight thousand, nine hundred nineteen".