1287367 has 4 divisors (see below), whose sum is σ = 1292200. Its totient is φ = 1282536.

The previous prime is 1287361. The next prime is 1287371. The reversal of 1287367 is 7637821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7637821 = 1753 ⋅4357.

It is a cyclic number.

It is not a de Polignac number, because 1287367 - 2⁷ = 1287239 is a prime.

It is a Duffinian number.

1287367 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287361) by changing a digit.

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, 1992 + ... + 2557.

It is an arithmetic number, because the mean of its divisors is an integer number (323050).

2^1287367 is an apocalyptic number.

1287367 is a deficient number, since it is larger than the sum of its proper divisors (4833).

1287367 is an equidigital number, since it uses as much as digits as its factorization.

1287367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4832.

The product of its digits is 14112, while the sum is 34.

The square root of 1287367 is about 1134.6219634751. The cubic root of 1287367 is about 108.7846095859.

The spelling of 1287367 in words is "one million, two hundred eighty-seven thousand, three hundred sixty-seven".