208742389 has 2 divisors, whose sum is σ = 208742390. Its totient is φ = 208742388.

The previous prime is 208742383. The next prime is 208742441. The reversal of 208742389 is 983247802.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138886225 + 69856164 = 11785^2 + 8358^2 .

It is a cyclic number.

It is not a de Polignac number, because 208742389 - 2³ = 208742381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208742381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104371194 + 104371195.

It is an arithmetic number, because the mean of its divisors is an integer number (104371195).

Almost surely, 2^208742389 is an apocalyptic number.

It is an amenable number.

208742389 is a deficient number, since it is larger than the sum of its proper divisors (1).

208742389 is an equidigital number, since it uses as much as digits as its factorization.

208742389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 208742389 is about 14447.9198848831. The cubic root of 208742389 is about 593.2032883854.

The spelling of 208742389 in words is "two hundred eight million, seven hundred forty-two thousand, three hundred eighty-nine".