1287075 has 18 divisors (see below), whose sum is σ = 2144332. Its totient is φ = 681200.

The previous prime is 1287071. The next prime is 1287101. The reversal of 1287075 is 5707821.

It is a happy number.

It is not a de Polignac number, because 1287075 - 2² = 1287071 is a prime.

It is a Duffinian number.

1287075 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1287071) 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 17 ways as a sum of consecutive naturals, for example, 9760 + ... + 9890.

2^1287075 is an apocalyptic number.

1287075 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1287075 is a deficient number, since it is larger than the sum of its proper divisors (857257).

1287075 is an equidigital number, since it uses as much as digits as its factorization.

1287075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275 (or 139 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 30.

The square root of 1287075 is about 1134.4932789576. The cubic root of 1287075 is about 108.7763841387.

The spelling of 1287075 in words is "one million, two hundred eighty-seven thousand, seventy-five".