208401889 has 2 divisors, whose sum is σ = 208401890. Its totient is φ = 208401888.

The previous prime is 208401847. The next prime is 208401911. The reversal of 208401889 is 988104802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139428864 + 68973025 = 11808^2 + 8305^2 .

It is a cyclic number.

It is not a de Polignac number, because 208401889 - 2¹³ = 208393697 is a prime.

It is not a weakly prime, because it can be changed into another prime (208401829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104200944 + 104200945.

It is an arithmetic number, because the mean of its divisors is an integer number (104200945).

Almost surely, 2^208401889 is an apocalyptic number.

It is an amenable number.

208401889 is a deficient number, since it is larger than the sum of its proper divisors (1).

208401889 is an equidigital number, since it uses as much as digits as its factorization.

208401889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 208401889 is about 14436.1313723587. The cubic root of 208401889 is about 592.8805690015.

The spelling of 208401889 in words is "two hundred eight million, four hundred one thousand, eight hundred eighty-nine".