1218487 has 2 divisors, whose sum is σ = 1218488. Its totient is φ = 1218486.

The previous prime is 1218473. The next prime is 1218533. The reversal of 1218487 is 7848121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1218487 is a prime.

1218487 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1218457) 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 as a sum of consecutive naturals, namely, 609243 + 609244.

It is an arithmetic number, because the mean of its divisors is an integer number (609244).

2^1218487 is an apocalyptic number.

1218487 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218487 is an equidigital number, since it uses as much as digits as its factorization.

1218487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3584, while the sum is 31.

The square root of 1218487 is about 1103.8509863202. The cubic root of 1218487 is about 106.8087830078.

The spelling of 1218487 in words is "one million, two hundred eighteen thousand, four hundred eighty-seven".