196827809 has 4 divisors (see below), whose sum is σ = 197965716. Its totient is φ = 195689904.

The previous prime is 196827803. The next prime is 196827811. The reversal of 196827809 is 908728691.

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

It can be written as a sum of positive squares in 2 ways, for example, as 161163025 + 35664784 = 12695^2 + 5972^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-196827809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (196827803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 568694 + ... + 569039.

It is an arithmetic number, because the mean of its divisors is an integer number (49491429).

Almost surely, 2^196827809 is an apocalyptic number.

It is an amenable number.

196827809 is a deficient number, since it is larger than the sum of its proper divisors (1137907).

196827809 is a wasteful number, since it uses less digits than its factorization.

196827809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1137906.

The product of its (nonzero) digits is 435456, while the sum is 50.

The square root of 196827809 is about 14029.5334562486. The cubic root of 196827809 is about 581.6952079255.

The spelling of 196827809 in words is "one hundred ninety-six million, eight hundred twenty-seven thousand, eight hundred nine".