196969721 has 8 divisors (see below), whose sum is σ = 212252040. Its totient is φ = 181706112.

The previous prime is 196969709. The next prime is 196969733. The reversal of 196969721 is 127969691.

It is an interprime number because it is at equal distance from previous prime (196969709) and next prime (196969733).

It can be written as a sum of positive squares in 4 ways, for example, as 50922496 + 146047225 = 7136^2 + 12085^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 196969721 - 2²² = 192775417 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 196969721.

It is not an unprimeable number, because it can be changed into a prime (196969741) 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 7 ways as a sum of consecutive naturals, for example, 23531 + ... + 30783.

It is an arithmetic number, because the mean of its divisors is an integer number (26531505).

Almost surely, 2^196969721 is an apocalyptic number.

It is an amenable number.

196969721 is a deficient number, since it is larger than the sum of its proper divisors (15282319).

196969721 is a wasteful number, since it uses less digits than its factorization.

196969721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9355.

The product of its digits is 367416, while the sum is 50.

The square root of 196969721 is about 14034.5901614547. The cubic root of 196969721 is about 581.8349742512.

The spelling of 196969721 in words is "one hundred ninety-six million, nine hundred sixty-nine thousand, seven hundred twenty-one".