196663921 has 8 divisors (see below), whose sum is σ = 202581288. Its totient is φ = 190800000.

The previous prime is 196663891. The next prime is 196663949. The reversal of 196663921 is 129366691.

It can be written as a sum of positive squares in 4 ways, for example, as 18147600 + 178516321 = 4260^2 + 13361^2 .

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

It is a 5-Lehmer number, since φ(196663921) divides (196663921-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 196663921 - 2¹¹ = 196661873 is a prime.

It is a super-3 number, since 3×196663921³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (196663121) 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, 5830 + ... + 20671.

It is an arithmetic number, because the mean of its divisors is an integer number (25322661).

Almost surely, 2^196663921 is an apocalyptic number.

It is an amenable number.

196663921 is a deficient number, since it is larger than the sum of its proper divisors (5917367).

196663921 is a wasteful number, since it uses less digits than its factorization.

196663921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26723.

The product of its digits is 104976, while the sum is 43.

The square root of 196663921 is about 14023.6914184533. The cubic root of 196663921 is about 581.5337142549.

The spelling of 196663921 in words is "one hundred ninety-six million, six hundred sixty-three thousand, nine hundred twenty-one".