2556003 has 8 divisors (see below), whose sum is σ = 3429568. Its totient is φ = 1693224.

The previous prime is 2555989. The next prime is 2556011. The reversal of 2556003 is 3006552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2556003 - 2²⁰ = 1507427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2556023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2125 + ... + 3102.

It is an arithmetic number, because the mean of its divisors is an integer number (428696).

2^2556003 is an apocalyptic number.

2556003 is a deficient number, since it is larger than the sum of its proper divisors (873565).

2556003 is a wasteful number, since it uses less digits than its factorization.

2556003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5393.

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 2556003 is about 1598.7504495699. The cubic root of 2556003 is about 136.7268430877.

The spelling of 2556003 in words is "two million, five hundred fifty-six thousand, three".