2565406 has 4 divisors (see below), whose sum is σ = 3848112. Its totient is φ = 1282702.

The previous prime is 2565403. The next prime is 2565449. The reversal of 2565406 is 6045652.

2565406 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2565403) 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, 641350 + ... + 641353.

It is an arithmetic number, because the mean of its divisors is an integer number (962028).

2^2565406 is an apocalyptic number.

2565406 is a deficient number, since it is larger than the sum of its proper divisors (1282706).

2565406 is a wasteful number, since it uses less digits than its factorization.

2565406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1282705.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 2565406 is about 1601.6884840692. The cubic root of 2565406 is about 136.8943010528.

The spelling of 2565406 in words is "two million, five hundred sixty-five thousand, four hundred six".