208199797 has 8 divisors (see below), whose sum is σ = 224563640. Its totient is φ = 191885760.

The previous prime is 208199779. The next prime is 208199807. The reversal of 208199797 is 797991802.

It can be written as a sum of positive squares in 4 ways, for example, as 3538161 + 204661636 = 1881^2 + 14306^2 .

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 208199797 - 2⁷ = 208199669 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 (208199597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3522 + ... + 20707.

It is an arithmetic number, because the mean of its divisors is an integer number (28070455).

Almost surely, 2^208199797 is an apocalyptic number.

It is an amenable number.

208199797 is a deficient number, since it is larger than the sum of its proper divisors (16363843).

208199797 is a wasteful number, since it uses less digits than its factorization.

208199797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24903.

The product of its (nonzero) digits is 571536, while the sum is 52.

The square root of 208199797 is about 14429.1301539629. The cubic root of 208199797 is about 592.6888638128.

The spelling of 208199797 in words is "two hundred eight million, one hundred ninety-nine thousand, seven hundred ninety-seven".