1288717 has 4 divisors (see below), whose sum is σ = 1294720. Its totient is φ = 1282716.

The previous prime is 1288711. The next prime is 1288733. The reversal of 1288717 is 7178821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7178821 = 13 ⋅552217.

It is a cyclic number.

It is not a de Polignac number, because 1288717 - 2³ = 1288709 is a prime.

It is a Duffinian number.

1288717 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1288711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2667 + ... + 3112.

It is an arithmetic number, because the mean of its divisors is an integer number (323680).

2^1288717 is an apocalyptic number.

It is an amenable number.

1288717 is a deficient number, since it is larger than the sum of its proper divisors (6003).

1288717 is an equidigital number, since it uses as much as digits as its factorization.

1288717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6002.

The product of its digits is 6272, while the sum is 34.

The square root of 1288717 is about 1135.2167193977. The cubic root of 1288717 is about 108.8226220351.

The spelling of 1288717 in words is "one million, two hundred eighty-eight thousand, seven hundred seventeen".