1243263 has 16 divisors (see below), whose sum is σ = 1922816. Its totient is φ = 699840.

The previous prime is 1243211. The next prime is 1243271. The reversal of 1243263 is 3623421.

It is a happy number.

It is not a de Polignac number, because 1243263 - 2²⁰ = 194687 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243273) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1128 + ... + 1938.

It is an arithmetic number, because the mean of its divisors is an integer number (120176).

2^1243263 is an apocalyptic number.

1243263 is a deficient number, since it is larger than the sum of its proper divisors (679553).

1243263 is an equidigital number, since it uses as much as digits as its factorization.

1243263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894.

The product of its digits is 864, while the sum is 21.

The square root of 1243263 is about 1115.0170402285. The cubic root of 1243263 is about 107.5278600947.

Adding to 1243263 its reverse (3623421), we get a palindrome (4866684).

The spelling of 1243263 in words is "one million, two hundred forty-three thousand, two hundred sixty-three".