1243563 has 4 divisors (see below), whose sum is σ = 1658088. Its totient is φ = 829040.

The previous prime is 1243559. The next prime is 1243577. The reversal of 1243563 is 3653421.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1243563 - 2² = 1243559 is a prime.

It is a D-number.

1243563 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1243523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207258 + ... + 207263.

It is an arithmetic number, because the mean of its divisors is an integer number (414522).

2^1243563 is an apocalyptic number.

1243563 is a deficient number, since it is larger than the sum of its proper divisors (414525).

1243563 is an equidigital number, since it uses as much as digits as its factorization.

1243563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414524.

The product of its digits is 2160, while the sum is 24.

The square root of 1243563 is about 1115.1515592062. The cubic root of 1243563 is about 107.5365082418.

Adding to 1243563 its reverse (3653421), we get a palindrome (4896984).

The spelling of 1243563 in words is "one million, two hundred forty-three thousand, five hundred sixty-three".