1216823 has 2 divisors, whose sum is σ = 1216824. Its totient is φ = 1216822.

The previous prime is 1216807. The next prime is 1216841. The reversal of 1216823 is 3286121.

It is a weak prime.

It is an emirp because it is prime and its reverse (3286121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1216823 - 2⁴ = 1216807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608411 + 608412.

It is an arithmetic number, because the mean of its divisors is an integer number (608412).

2^1216823 is an apocalyptic number.

1216823 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216823 is an equidigital number, since it uses as much as digits as its factorization.

1216823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 23.

The square root of 1216823 is about 1103.0970038940. The cubic root of 1216823 is about 106.7601405026.

The spelling of 1216823 in words is "one million, two hundred sixteen thousand, eight hundred twenty-three".