1243255 has 16 divisors (see below), whose sum is σ = 1661184. Its totient is φ = 887040.

The previous prime is 1243211. The next prime is 1243271. The reversal of 1243255 is 5523421.

It is not a de Polignac number, because 1243255 - 2¹³ = 1235063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1707 + ... + 2323.

It is an arithmetic number, because the mean of its divisors is an integer number (103824).

2^1243255 is an apocalyptic number.

1243255 is a deficient number, since it is larger than the sum of its proper divisors (417929).

1243255 is a wasteful number, since it uses less digits than its factorization.

1243255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666.

The product of its digits is 1200, while the sum is 22.

The square root of 1243255 is about 1115.0134528336. The cubic root of 1243255 is about 107.5276294584.

Adding to 1243255 its reverse (5523421), we get a palindrome (6766676).

The spelling of 1243255 in words is "one million, two hundred forty-three thousand, two hundred fifty-five".