1287165 has 32 divisors (see below), whose sum is σ = 2332800. Its totient is φ = 600320.

The previous prime is 1287163. The next prime is 1287173. The reversal of 1287165 is 5617821.

1287165 = T₅₄ + T₅₅ + ... + T₁₉₈.

It is not a de Polignac number, because 1287165 - 2¹ = 1287163 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287163) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4651 + ... + 4919.

It is an arithmetic number, because the mean of its divisors is an integer number (72900).

2^1287165 is an apocalyptic number.

1287165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1287165 is a deficient number, since it is larger than the sum of its proper divisors (1045635).

1287165 is a wasteful number, since it uses less digits than its factorization.

1287165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317.

The product of its digits is 3360, while the sum is 30.

The square root of 1287165 is about 1134.5329435499. The cubic root of 1287165 is about 108.7789195119.

The spelling of 1287165 in words is "one million, two hundred eighty-seven thousand, one hundred sixty-five".