208429189 has 8 divisors (see below), whose sum is σ = 212005080. Its totient is φ = 204880896.

The previous prime is 208429157. The next prime is 208429201. The reversal of 208429189 is 981924802.

It can be written as a sum of positive squares in 4 ways, for example, as 103530625 + 104898564 = 10175^2 + 10242^2 .

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 208429189 - 2⁵ = 208429157 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 (208429139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8629 + ... + 22165.

It is an arithmetic number, because the mean of its divisors is an integer number (26500635).

Almost surely, 2^208429189 is an apocalyptic number.

It is an amenable number.

208429189 is a deficient number, since it is larger than the sum of its proper divisors (3575891).

208429189 is a wasteful number, since it uses less digits than its factorization.

208429189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13799.

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 208429189 is about 14437.0768855749. The cubic root of 208429189 is about 592.9064563754.

The spelling of 208429189 in words is "two hundred eight million, four hundred twenty-nine thousand, one hundred eighty-nine".