2560403 has 4 divisors (see below), whose sum is σ = 2584440. Its totient is φ = 2536368.

The previous prime is 2560399. The next prime is 2560417. The reversal of 2560403 is 3040652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2560403 - 2² = 2560399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2560433) 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, 11858 + ... + 12071.

It is an arithmetic number, because the mean of its divisors is an integer number (646110).

2^2560403 is an apocalyptic number.

2560403 is a deficient number, since it is larger than the sum of its proper divisors (24037).

2560403 is a wasteful number, since it uses less digits than its factorization.

2560403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24036.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 2560403 is about 1600.1259325441. The cubic root of 2560403 is about 136.8052536940.

Subtracting 2560403 from its reverse (3040652), we obtain a square (480249 = 693²).

The spelling of 2560403 in words is "two million, five hundred sixty thousand, four hundred three".