208197172 has 6 divisors (see below), whose sum is σ = 364345058. Its totient is φ = 104098584.

The previous prime is 208197167. The next prime is 208197203. The reversal of 208197172 is 271791802.

It can be written as a sum of positive squares in only one way, i.e., 167288356 + 40908816 = 12934^2 + 6396^2 .

It is a super-3 number, since 3×208197172³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 26024643 + ... + 26024650.

Almost surely, 2^208197172 is an apocalyptic number.

It is an amenable number.

208197172 is a deficient number, since it is larger than the sum of its proper divisors (156147886).

208197172 is a wasteful number, since it uses less digits than its factorization.

208197172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52049297 (or 52049295 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 208197172 is about 14429.0391918520. The cubic root of 208197172 is about 592.6863729125.

The spelling of 208197172 in words is "two hundred eight million, one hundred ninety-seven thousand, one hundred seventy-two".