203998489 has 2 divisors, whose sum is σ = 203998490. Its totient is φ = 203998488.

The previous prime is 203998463. The next prime is 203998513. The reversal of 203998489 is 984899302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 203918400 + 80089 = 14280^2 + 283^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203998489 is a prime.

It is not a weakly prime, because it can be changed into another prime (203998409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101999244 + 101999245.

It is an arithmetic number, because the mean of its divisors is an integer number (101999245).

Almost surely, 2^203998489 is an apocalyptic number.

It is an amenable number.

203998489 is a deficient number, since it is larger than the sum of its proper divisors (1).

203998489 is an equidigital number, since it uses as much as digits as its factorization.

203998489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1119744, while the sum is 52.

The square root of 203998489 is about 14282.8039614076. The cubic root of 203998489 is about 588.6750782693.

The spelling of 203998489 in words is "two hundred three million, nine hundred ninety-eight thousand, four hundred eighty-nine".