208740139 has 2 divisors, whose sum is σ = 208740140. Its totient is φ = 208740138.

The previous prime is 208740131. The next prime is 208740179. The reversal of 208740139 is 931047802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 208740139 - 2³ = 208740131 is a prime.

It is not a weakly prime, because it can be changed into another prime (208740131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104370069 + 104370070.

It is an arithmetic number, because the mean of its divisors is an integer number (104370070).

Almost surely, 2^208740139 is an apocalyptic number.

208740139 is a deficient number, since it is larger than the sum of its proper divisors (1).

208740139 is an equidigital number, since it uses as much as digits as its factorization.

208740139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 208740139 is about 14447.8420187930. The cubic root of 208740139 is about 593.2011570308.

The spelling of 208740139 in words is "two hundred eight million, seven hundred forty thousand, one hundred thirty-nine".