208000139 has 2 divisors, whose sum is σ = 208000140. Its totient is φ = 208000138.

The previous prime is 208000103. The next prime is 208000181. The reversal of 208000139 is 931000802.

208000139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 208000139 - 2¹² = 207996043 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (208000439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104000069 + 104000070.

It is an arithmetic number, because the mean of its divisors is an integer number (104000070).

Almost surely, 2^208000139 is an apocalyptic number.

208000139 is a deficient number, since it is larger than the sum of its proper divisors (1).

208000139 is an equidigital number, since it uses as much as digits as its factorization.

208000139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 208000139 is about 14422.2099208131. The cubic root of 208000139 is about 592.4993456644.

The spelling of 208000139 in words is "two hundred eight million, one hundred thirty-nine", and thus it is an aban number.