1242355267 has 4 divisors (see below), whose sum is σ = 1243172520. Its totient is φ = 1241538016.

The previous prime is 1242355243. The next prime is 1242355307. The reversal of 1242355267 is 7625532421.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242355267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242355207) 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, 406342 + ... + 409387.

It is an arithmetic number, because the mean of its divisors is an integer number (310793130).

Almost surely, 2^1242355267 is an apocalyptic number.

1242355267 is a deficient number, since it is larger than the sum of its proper divisors (817253).

1242355267 is an equidigital number, since it uses as much as digits as its factorization.

1242355267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817252.

The product of its digits is 100800, while the sum is 37.

The square root of 1242355267 is about 35247.0604022520. The cubic root of 1242355267 is about 1075.0168425701.

Adding to 1242355267 its reverse (7625532421), we get a palindrome (8867887688).

The spelling of 1242355267 in words is "one billion, two hundred forty-two million, three hundred fifty-five thousand, two hundred sixty-seven".