2563903 has 4 divisors (see below), whose sum is σ = 2567448. Its totient is φ = 2560360.

The previous prime is 2563901. The next prime is 2563907. The reversal of 2563903 is 3093652.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2563903 - 2¹ = 2563901 is a prime.

It is a deceptive number, since it divides R_2563902.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2563901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253 + ... + 2278.

It is an arithmetic number, because the mean of its divisors is an integer number (641862).

2^2563903 is an apocalyptic number.

2563903 is the 1013-rd heptagonal number.

2563903 is a deficient number, since it is larger than the sum of its proper divisors (3545).

2563903 is a wasteful number, since it uses less digits than its factorization.

2563903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3544.

The product of its (nonzero) digits is 4860, while the sum is 28.

The square root of 2563903 is about 1601.2192229673. The cubic root of 2563903 is about 136.8675616427.

The spelling of 2563903 in words is "two million, five hundred sixty-three thousand, nine hundred three".