1287135 has 12 divisors (see below), whose sum is σ = 2231112. Its totient is φ = 686448.

The previous prime is 1287133. The next prime is 1287157. The reversal of 1287135 is 5317821.

It is not a de Polignac number, because 1287135 - 2¹ = 1287133 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1287099 and 1287108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14257 + ... + 14346.

It is an arithmetic number, because the mean of its divisors is an integer number (185926).

2^1287135 is an apocalyptic number.

1287135 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1287135 is a deficient number, since it is larger than the sum of its proper divisors (943977).

1287135 is a wasteful number, since it uses less digits than its factorization.

1287135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28614 (or 28611 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 1287135 is about 1134.5197221732. The cubic root of 1287135 is about 108.7780744006.

Adding to 1287135 its product of digits (1680), we get a triangular number (1288815 = T₁₆₀₅).

The spelling of 1287135 in words is "one million, two hundred eighty-seven thousand, one hundred thirty-five".