208632397 has 2 divisors, whose sum is σ = 208632398. Its totient is φ = 208632396.

The previous prime is 208632373. The next prime is 208632401. The reversal of 208632397 is 793236802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140635881 + 67996516 = 11859^2 + 8246^2 .

It is a cyclic number.

It is not a de Polignac number, because 208632397 - 2¹¹ = 208630349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208632317) 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 as a sum of consecutive naturals, namely, 104316198 + 104316199.

It is an arithmetic number, because the mean of its divisors is an integer number (104316199).

Almost surely, 2^208632397 is an apocalyptic number.

It is an amenable number.

208632397 is a deficient number, since it is larger than the sum of its proper divisors (1).

208632397 is an equidigital number, since it uses as much as digits as its factorization.

208632397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 208632397 is about 14444.1128838015. The cubic root of 208632397 is about 593.0990784707.

The spelling of 208632397 in words is "two hundred eight million, six hundred thirty-two thousand, three hundred ninety-seven".