2556407 has 4 divisors (see below), whose sum is σ = 2921616. Its totient is φ = 2191200.

The previous prime is 2556403. The next prime is 2556419. The reversal of 2556407 is 7046552.

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 2556407 - 2² = 2556403 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 2556407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2556403) 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, 182594 + ... + 182607.

It is an arithmetic number, because the mean of its divisors is an integer number (730404).

2^2556407 is an apocalyptic number.

2556407 is a deficient number, since it is larger than the sum of its proper divisors (365209).

2556407 is an equidigital number, since it uses as much as digits as its factorization.

2556407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365208.

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 2556407 is about 1598.8767932521. The cubic root of 2556407 is about 136.7340463571.

The spelling of 2556407 in words is "two million, five hundred fifty-six thousand, four hundred seven".