2557779 has 16 divisors (see below), whose sum is σ = 4024320. Its totient is φ = 1414080.

The previous prime is 2557777. The next prime is 2557781. The reversal of 2557779 is 9777552.

2557779 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2557777) and next prime (2557781).

It is not a de Polignac number, because 2557779 - 2¹ = 2557777 is a prime.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 2557779.

It is not an unprimeable number, because it can be changed into a prime (2557777) 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 in 15 ways as a sum of consecutive naturals, for example, 1314 + ... + 2615.

It is an arithmetic number, because the mean of its divisors is an integer number (251520).

2^2557779 is an apocalyptic number.

2557779 is a deficient number, since it is larger than the sum of its proper divisors (1466541).

2557779 is a wasteful number, since it uses less digits than its factorization.

2557779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3970.

The product of its digits is 154350, while the sum is 42.

The square root of 2557779 is about 1599.3057868963. The cubic root of 2557779 is about 136.7585032818.

The spelling of 2557779 in words is "two million, five hundred fifty-seven thousand, seven hundred seventy-nine".