1216847 has 2 divisors, whose sum is σ = 1216848. Its totient is φ = 1216846.

The previous prime is 1216841. The next prime is 1216849. The reversal of 1216847 is 7486121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1216847 - 2⁸ = 1216591 is a prime.

Together with 1216849, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608423 + 608424.

It is an arithmetic number, because the mean of its divisors is an integer number (608424).

2^1216847 is an apocalyptic number.

1216847 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216847 is an equidigital number, since it uses as much as digits as its factorization.

1216847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 29.

The square root of 1216847 is about 1103.1078823034. The cubic root of 1216847 is about 106.7608423923.

The spelling of 1216847 in words is "one million, two hundred sixteen thousand, eight hundred forty-seven".