1236643 has 2 divisors, whose sum is σ = 1236644. Its totient is φ = 1236642.

The previous prime is 1236629. The next prime is 1236659. The reversal of 1236643 is 3466321.

It is a weak prime.

It is an emirp because it is prime and its reverse (3466321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1236643 - 2⁵ = 1236611 is a prime.

It is not a weakly prime, because it can be changed into another prime (1236623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 618321 + 618322.

It is an arithmetic number, because the mean of its divisors is an integer number (618322).

2^1236643 is an apocalyptic number.

1236643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1236643 is an equidigital number, since it uses as much as digits as its factorization.

1236643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 25.

The square root of 1236643 is about 1112.0445134975. The cubic root of 1236643 is about 107.3366692206.

The spelling of 1236643 in words is "one million, two hundred thirty-six thousand, six hundred forty-three".