2557798 has 4 divisors (see below), whose sum is σ = 3836700. Its totient is φ = 1278898.

The previous prime is 2557781. The next prime is 2557813. The reversal of 2557798 is 8977552.

2557798 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 639448 + ... + 639451.

It is an arithmetic number, because the mean of its divisors is an integer number (959175).

2^2557798 is an apocalyptic number.

2557798 is a deficient number, since it is larger than the sum of its proper divisors (1278902).

2557798 is a wasteful number, since it uses less digits than its factorization.

2557798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278901.

The product of its digits is 176400, while the sum is 43.

The square root of 2557798 is about 1599.3117269626. The cubic root of 2557798 is about 136.7588419096.

The spelling of 2557798 in words is "two million, five hundred fifty-seven thousand, seven hundred ninety-eight".