2557397 has 2 divisors, whose sum is σ = 2557398. Its totient is φ = 2557396.

The previous prime is 2557369. The next prime is 2557417. The reversal of 2557397 is 7937552.

2557397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2390116 + 167281 = 1546^2 + 409^2 .

It is a cyclic number.

It is not a de Polignac number, because 2557397 - 2⁶ = 2557333 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2557397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2557337) 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 as a sum of consecutive naturals, namely, 1278698 + 1278699.

It is an arithmetic number, because the mean of its divisors is an integer number (1278699).

2^2557397 is an apocalyptic number.

It is an amenable number.

2557397 is a deficient number, since it is larger than the sum of its proper divisors (1).

2557397 is an equidigital number, since it uses as much as digits as its factorization.

2557397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 66150, while the sum is 38.

The square root of 2557397 is about 1599.1863556196. The cubic root of 2557397 is about 136.7516947253.

The spelling of 2557397 in words is "two million, five hundred fifty-seven thousand, three hundred ninety-seven".