196640897 has 4 divisors (see below), whose sum is σ = 197079300. Its totient is φ = 196202496.

The previous prime is 196640893. The next prime is 196640911. The reversal of 196640897 is 798046691.

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 43970161 + 152670736 = 6631^2 + 12356^2 .

It is a cyclic number.

It is not a de Polignac number, because 196640897 - 2² = 196640893 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (196640893) 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, 218528 + ... + 219425.

It is an arithmetic number, because the mean of its divisors is an integer number (49269825).

Almost surely, 2^196640897 is an apocalyptic number.

It is an amenable number.

196640897 is a deficient number, since it is larger than the sum of its proper divisors (438403).

196640897 is an equidigital number, since it uses as much as digits as its factorization.

196640897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438402.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 196640897 is about 14022.8704978688. The cubic root of 196640897 is about 581.5110194385.

The spelling of 196640897 in words is "one hundred ninety-six million, six hundred forty thousand, eight hundred ninety-seven".