1287249 has 4 divisors (see below), whose sum is σ = 1716336. Its totient is φ = 858164.

The previous prime is 1287239. The next prime is 1287289. The reversal of 1287249 is 9427821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1287249 - 2⁴ = 1287233 is a prime.

It is a D-number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1287239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214539 + ... + 214544.

It is an arithmetic number, because the mean of its divisors is an integer number (429084).

2^1287249 is an apocalyptic number.

It is an amenable number.

1287249 is a deficient number, since it is larger than the sum of its proper divisors (429087).

1287249 is an equidigital number, since it uses as much as digits as its factorization.

1287249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429086.

The product of its digits is 8064, while the sum is 33.

The square root of 1287249 is about 1134.5699625849. The cubic root of 1287249 is about 108.7812857536.

It can be divided in two parts, 12872 and 49, that added together give a palindrome (12921).

The spelling of 1287249 in words is "one million, two hundred eighty-seven thousand, two hundred forty-nine".