208542739 has 2 divisors, whose sum is σ = 208542740. Its totient is φ = 208542738.

The previous prime is 208542731. The next prime is 208542749. The reversal of 208542739 is 937245802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 208542739 - 2³ = 208542731 is a prime.

It is not a weakly prime, because it can be changed into another prime (208542731) 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, 104271369 + 104271370.

It is an arithmetic number, because the mean of its divisors is an integer number (104271370).

Almost surely, 2^208542739 is an apocalyptic number.

208542739 is a deficient number, since it is larger than the sum of its proper divisors (1).

208542739 is an equidigital number, since it uses as much as digits as its factorization.

208542739 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 208542739 is about 14441.0089328966. The cubic root of 208542739 is about 593.0141065342.

The spelling of 208542739 in words is "two hundred eight million, five hundred forty-two thousand, seven hundred thirty-nine".