1218247 has 2 divisors, whose sum is σ = 1218248. Its totient is φ = 1218246.

The previous prime is 1218221. The next prime is 1218251. The reversal of 1218247 is 7428121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1218247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1218257) 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 as a sum of consecutive naturals, namely, 609123 + 609124.

It is an arithmetic number, because the mean of its divisors is an integer number (609124).

2^1218247 is an apocalyptic number.

1218247 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218247 is an equidigital number, since it uses as much as digits as its factorization.

1218247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 896, while the sum is 25.

The square root of 1218247 is about 1103.7422706411. The cubic root of 1218247 is about 106.8017699960.

The spelling of 1218247 in words is "one million, two hundred eighteen thousand, two hundred forty-seven".