28390003 has 2 divisors, whose sum is σ = 28390004.
Its totient is φ = 28390002.
The previous prime is 28390001. The next prime is 28390091. The reversal of 28390003 is 30009382.
Adding to 28390003 its reverse (30009382), we get a palindrome (58399385).
It is a happy number.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 28390003 - 21 = 28390001 is a prime.
Together with 28390001, it forms a pair of twin primes.
It is a self number, because there is not a number n which added to its sum of digits gives 28390003.
It is not a weakly prime, because it can be changed into another prime (28390001) 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, 14195001 + 14195002.
It is an arithmetic number, because the mean of its divisors is an integer number (14195002).
Almost surely, 228390003 is an apocalyptic number.
28390003 is a deficient number, since it is larger than the sum of its proper divisors (1).
28390003 is an equidigital number, since it uses as much as digits as its factorization.
28390003 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 1296, while the sum is 25.
The square root of 28390003 is about 5328.2270034224.
The cubic root of 28390003 is about 305.0622572901.
The spelling of 28390003 in words is "twenty-eight million, three hundred ninety thousand, three".