2556745 has 8 divisors (see below), whose sum is σ = 3088584. Its totient is φ = 2031744.

The previous prime is 2556739. The next prime is 2556761. The reversal of 2556745 is 5476552.

It can be written as a sum of positive squares in 4 ways, for example, as 413449 + 2143296 = 643^2 + 1464^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2556745 - 2⁵ = 2556713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2556745.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 844 + ... + 2413.

It is an arithmetic number, because the mean of its divisors is an integer number (386073).

2^2556745 is an apocalyptic number.

It is an amenable number.

2556745 is a deficient number, since it is larger than the sum of its proper divisors (531839).

2556745 is a wasteful number, since it uses less digits than its factorization.

2556745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3419.

The product of its digits is 42000, while the sum is 34.

The square root of 2556745 is about 1598.9824889598. The cubic root of 2556745 is about 136.7400722717.

The spelling of 2556745 in words is "two million, five hundred fifty-six thousand, seven hundred forty-five".