208416389 has 2 divisors, whose sum is σ = 208416390. Its totient is φ = 208416388.

The previous prime is 208416367. The next prime is 208416421. The reversal of 208416389 is 983614802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125059489 + 83356900 = 11183^2 + 9130^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-208416389 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208416349) 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 as a sum of consecutive naturals, namely, 104208194 + 104208195.

It is an arithmetic number, because the mean of its divisors is an integer number (104208195).

Almost surely, 2^208416389 is an apocalyptic number.

It is an amenable number.

208416389 is a deficient number, since it is larger than the sum of its proper divisors (1).

208416389 is an equidigital number, since it uses as much as digits as its factorization.

208416389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 208416389 is about 14436.6335757336. The cubic root of 208416389 is about 592.8943189871.

The spelling of 208416389 in words is "two hundred eight million, four hundred sixteen thousand, three hundred eighty-nine".