1288761 has 4 divisors (see below), whose sum is σ = 1718352. Its totient is φ = 859172.

The previous prime is 1288733. The next prime is 1288769. The reversal of 1288761 is 1678821.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 1288761 - 2⁶ = 1288697 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1288769) 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 in 3 ways as a sum of consecutive naturals, for example, 214791 + ... + 214796.

It is an arithmetic number, because the mean of its divisors is an integer number (429588).

2^1288761 is an apocalyptic number.

It is an amenable number.

1288761 is a deficient number, since it is larger than the sum of its proper divisors (429591).

1288761 is an equidigital number, since it uses as much as digits as its factorization.

1288761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429590.

The product of its digits is 5376, while the sum is 33.

The square root of 1288761 is about 1135.2360987918. The cubic root of 1288761 is about 108.8238605126.

The spelling of 1288761 in words is "one million, two hundred eighty-eight thousand, seven hundred sixty-one".