2556417 has 4 divisors (see below), whose sum is σ = 3408560. Its totient is φ = 1704276.

The previous prime is 2556403. The next prime is 2556419. The reversal of 2556417 is 7146552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2556417 - 2⁸ = 2556161 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2556419) 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, 426067 + ... + 426072.

It is an arithmetic number, because the mean of its divisors is an integer number (852140).

2^2556417 is an apocalyptic number.

It is an amenable number.

2556417 is a deficient number, since it is larger than the sum of its proper divisors (852143).

2556417 is an equidigital number, since it uses as much as digits as its factorization.

2556417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852142.

The product of its digits is 8400, while the sum is 30.

The square root of 2556417 is about 1598.8799204443. The cubic root of 2556417 is about 136.7342246462.

The spelling of 2556417 in words is "two million, five hundred fifty-six thousand, four hundred seventeen".