196593821 has 4 divisors (see below), whose sum is σ = 196667100. Its totient is φ = 196520544.

The previous prime is 196593799. The next prime is 196593823. The reversal of 196593821 is 128395691.

It is a happy number.

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 57684025 + 138909796 = 7595^2 + 11786^2 .

It is a cyclic number.

It is not a de Polignac number, because 196593821 - 2⁶ = 196593757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (196593823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32456 + ... + 38033.

It is an arithmetic number, because the mean of its divisors is an integer number (49166775).

Almost surely, 2^196593821 is an apocalyptic number.

It is an amenable number.

196593821 is a deficient number, since it is larger than the sum of its proper divisors (73279).

196593821 is an equidigital number, since it uses as much as digits as its factorization.

196593821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73278.

The product of its digits is 116640, while the sum is 44.

The square root of 196593821 is about 14021.1918537619. The cubic root of 196593821 is about 581.4646109887.

The spelling of 196593821 in words is "one hundred ninety-six million, five hundred ninety-three thousand, eight hundred twenty-one".