1285903 has 2 divisors, whose sum is σ = 1285904. Its totient is φ = 1285902.

The previous prime is 1285891. The next prime is 1285913. The reversal of 1285903 is 3095821.

It is a strong prime.

It is an emirp because it is prime and its reverse (3095821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1285903 - 2⁵ = 1285871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1285913) 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, 642951 + 642952.

It is an arithmetic number, because the mean of its divisors is an integer number (642952).

2^1285903 is an apocalyptic number.

1285903 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285903 is an equidigital number, since it uses as much as digits as its factorization.

1285903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 1285903 is about 1133.9766311525. The cubic root of 1285903 is about 108.7433571492.

The spelling of 1285903 in words is "one million, two hundred eighty-five thousand, nine hundred three".