2557823 has 2 divisors, whose sum is σ = 2557824. Its totient is φ = 2557822.

The previous prime is 2557817. The next prime is 2557843. The reversal of 2557823 is 3287552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2557823 - 2⁸ = 2557567 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2557823.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2557813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278911 + 1278912.

It is an arithmetic number, because the mean of its divisors is an integer number (1278912).

2^2557823 is an apocalyptic number.

2557823 is a deficient number, since it is larger than the sum of its proper divisors (1).

2557823 is an equidigital number, since it uses as much as digits as its factorization.

2557823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16800, while the sum is 32.

The square root of 2557823 is about 1599.3195428056. The cubic root of 2557823 is about 136.7592874700.

The spelling of 2557823 in words is "two million, five hundred fifty-seven thousand, eight hundred twenty-three".