203390489 has 2 divisors, whose sum is σ = 203390490. Its totient is φ = 203390488.

The previous prime is 203390471. The next prime is 203390491. The reversal of 203390489 is 984093302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194881600 + 8508889 = 13960^2 + 2917^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203390489 is a prime.

Together with 203390491, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (203390419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101695244 + 101695245.

It is an arithmetic number, because the mean of its divisors is an integer number (101695245).

Almost surely, 2^203390489 is an apocalyptic number.

It is an amenable number.

203390489 is a deficient number, since it is larger than the sum of its proper divisors (1).

203390489 is an equidigital number, since it uses as much as digits as its factorization.

203390489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 203390489 is about 14261.5037425932. The cubic root of 203390489 is about 588.0896644311.

The spelling of 203390489 in words is "two hundred three million, three hundred ninety thousand, four hundred eighty-nine".