1287775 has 6 divisors (see below), whose sum is σ = 1596872. Its totient is φ = 1030200.

The previous prime is 1287761. The next prime is 1287787. The reversal of 1287775 is 5777821.

It is not a de Polignac number, because 1287775 - 2⁵ = 1287743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25731 + ... + 25780.

2^1287775 is an apocalyptic number.

1287775 is a deficient number, since it is larger than the sum of its proper divisors (309097).

1287775 is an equidigital number, since it uses as much as digits as its factorization.

1287775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51521 (or 51516 counting only the distinct ones).

The product of its digits is 27440, while the sum is 37.

The square root of 1287775 is about 1134.8017447995. The cubic root of 1287775 is about 108.7961005937.

The spelling of 1287775 in words is "one million, two hundred eighty-seven thousand, seven hundred seventy-five".