8427557 has 2 divisors, whose sum is σ = 8427558. Its totient is φ = 8427556.

The previous prime is 8427539. The next prime is 8427569. The reversal of 8427557 is 7557248.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7230721 + 1196836 = 2689^2 + 1094^2 .

It is a cyclic number.

It is not a de Polignac number, because 8427557 - 2¹² = 8423461 is a prime.

It is a super-3 number, since 3×8427557³ (a number of 22 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8427557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8421557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4213778 + 4213779.

It is an arithmetic number, because the mean of its divisors is an integer number (4213779).

Almost surely, 2^8427557 is an apocalyptic number.

It is an amenable number.

8427557 is a deficient number, since it is larger than the sum of its proper divisors (1).

8427557 is an equidigital number, since it uses as much as digits as its factorization.

8427557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78400, while the sum is 38.

The square root of 8427557 is about 2903.0254907596. The cubic root of 8427557 is about 203.5013210579.

The spelling of 8427557 in words is "eight million, four hundred twenty-seven thousand, five hundred fifty-seven".