2565403 has 2 divisors, whose sum is σ = 2565404. Its totient is φ = 2565402.

The previous prime is 2565391. The next prime is 2565449. The reversal of 2565403 is 3045652.

2565403 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2565403 is a prime.

2565403 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2565463) 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, 1282701 + 1282702.

It is an arithmetic number, because the mean of its divisors is an integer number (1282702).

2^2565403 is an apocalyptic number.

2565403 is a deficient number, since it is larger than the sum of its proper divisors (1).

2565403 is an equidigital number, since it uses as much as digits as its factorization.

2565403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 2565403 is about 1601.6875475573. The cubic root of 2565403 is about 136.8942476911.

Subtracting 2565403 from its reverse (3045652), we obtain a square (480249 = 693²).

The spelling of 2565403 in words is "two million, five hundred sixty-five thousand, four hundred three".