2557443 has 16 divisors (see below), whose sum is σ = 3923456. Its totient is φ = 1451520.

The previous prime is 2557441. The next prime is 2557447. The reversal of 2557443 is 3447552.

It is not a de Polignac number, because 2557443 - 2¹ = 2557441 is a prime.

It is a Duffinian number.

2557443 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2557443.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2557441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3738 + ... + 4368.

It is an arithmetic number, because the mean of its divisors is an integer number (245216).

2^2557443 is an apocalyptic number.

2557443 is a deficient number, since it is larger than the sum of its proper divisors (1366013).

2557443 is a wasteful number, since it uses less digits than its factorization.

2557443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834.

The product of its digits is 16800, while the sum is 30.

The square root of 2557443 is about 1599.2007378688. The cubic root of 2557443 is about 136.7525146397.

The spelling of 2557443 in words is "two million, five hundred fifty-seven thousand, four hundred forty-three".