1243663 has 2 divisors, whose sum is σ = 1243664. Its totient is φ = 1243662.

The previous prime is 1243643. The next prime is 1243673. The reversal of 1243663 is 3663421.

It is a strong prime.

It is an emirp because it is prime and its reverse (3663421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1243663 - 2⁵ = 1243631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621831 + 621832.

It is an arithmetic number, because the mean of its divisors is an integer number (621832).

2^1243663 is an apocalyptic number.

1243663 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243663 is an equidigital number, since it uses as much as digits as its factorization.

1243663 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 1243663 is about 1115.1963952596. The cubic root of 1243663 is about 107.5393906484.

The spelling of 1243663 in words is "one million, two hundred forty-three thousand, six hundred sixty-three".