1288657 has 2 divisors, whose sum is σ = 1288658. Its totient is φ = 1288656.

The previous prime is 1288649. The next prime is 1288691. The reversal of 1288657 is 7568821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1263376 + 25281 = 1124^2 + 159^2 .

It is a cyclic number.

It is not a de Polignac number, because 1288657 - 2³ = 1288649 is a prime.

1288657 is a lucky number.

It is a plaindrome in base 14.

It is not a weakly prime, because it can be changed into another prime (1288607) 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, 644328 + 644329.

It is an arithmetic number, because the mean of its divisors is an integer number (644329).

2^1288657 is an apocalyptic number.

It is an amenable number.

1288657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1288657 is an equidigital number, since it uses as much as digits as its factorization.

1288657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26880, while the sum is 37.

The square root of 1288657 is about 1135.1902924180. The cubic root of 1288657 is about 108.8209331568.

The spelling of 1288657 in words is "one million, two hundred eighty-eight thousand, six hundred fifty-seven".