2857397 has 2 divisors, whose sum is σ = 2857398. Its totient is φ = 2857396.

The previous prime is 2857381. The next prime is 2857403. The reversal of 2857397 is 7937582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1623076 + 1234321 = 1274^2 + 1111^2 .

It is a cyclic number.

It is not a de Polignac number, because 2857397 - 2⁴ = 2857381 is a prime.

It is a d-powerful number, because it can be written as 2¹⁸ + 8² + 5⁴ + 7⁶ + 3¹³ + 9⁵ + 7⁷ .

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2857357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1428698 + 1428699.

It is an arithmetic number, because the mean of its divisors is an integer number (1428699).

2^2857397 is an apocalyptic number.

It is an amenable number.

2857397 is a deficient number, since it is larger than the sum of its proper divisors (1).

2857397 is an equidigital number, since it uses as much as digits as its factorization.

2857397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105840, while the sum is 41.

The square root of 2857397 is about 1690.3836842563. The cubic root of 2857397 is about 141.9025483581.

The spelling of 2857397 in words is "two million, eight hundred fifty-seven thousand, three hundred ninety-seven".