1218287 has 18 divisors (see below), whose sum is σ = 1513008. Its totient is φ = 977592.

The previous prime is 1218281. The next prime is 1218307. The reversal of 1218287 is 7828121.

It is not a de Polignac number, because 1218287 - 2¹⁶ = 1152751 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 25898 + ... + 25944.

It is an arithmetic number, because the mean of its divisors is an integer number (84056).

2^1218287 is an apocalyptic number.

1218287 is a deficient number, since it is larger than the sum of its proper divisors (294721).

1218287 is an equidigital number, since it uses as much as digits as its factorization.

1218287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107 (or 77 counting only the distinct ones).

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

The square root of 1218287 is about 1103.7603906646. The cubic root of 1218287 is about 106.8029388952.

The spelling of 1218287 in words is "one million, two hundred eighteen thousand, two hundred eighty-seven".