208449389 has 2 divisors, whose sum is σ = 208449390. Its totient is φ = 208449388.

The previous prime is 208449349. The next prime is 208449403. The reversal of 208449389 is 983944802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158634025 + 49815364 = 12595^2 + 7058^2 .

It is a cyclic number.

It is not a de Polignac number, because 208449389 - 2²⁰ = 207400813 is a prime.

It is a super-2 number, since 2×208449389² = 86902295548946642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208449349) 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, 104224694 + 104224695.

It is an arithmetic number, because the mean of its divisors is an integer number (104224695).

Almost surely, 2^208449389 is an apocalyptic number.

It is an amenable number.

208449389 is a deficient number, since it is larger than the sum of its proper divisors (1).

208449389 is an equidigital number, since it uses as much as digits as its factorization.

208449389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 497664, while the sum is 47.

The square root of 208449389 is about 14437.7764562276. The cubic root of 208449389 is about 592.9256096805.

The spelling of 208449389 in words is "two hundred eight million, four hundred forty-nine thousand, three hundred eighty-nine".