1287128 has 16 divisors (see below), whose sum is σ = 2426760. Its totient is φ = 640000.

The previous prime is 1287109. The next prime is 1287131. The reversal of 1287128 is 8217821.

It is a self number, because there is not a number n which added to its sum of digits gives 1287128.

It is a congruent number.

It is an unprimeable number.

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, 1688 + ... + 2328.

2^1287128 is an apocalyptic number.

It is an amenable number.

1287128 is a deficient number, since it is larger than the sum of its proper divisors (1139632).

1287128 is a wasteful number, since it uses less digits than its factorization.

1287128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898 (or 894 counting only the distinct ones).

The product of its digits is 1792, while the sum is 29.

The square root of 1287128 is about 1134.5166371632. The cubic root of 1287128 is about 108.7778772061. Note that the first 3 decimals are identical.

The spelling of 1287128 in words is "one million, two hundred eighty-seven thousand, one hundred twenty-eight".