1240134243 has 4 divisors (see below), whose sum is σ = 1653512328. Its totient is φ = 826756160.

The previous prime is 1240134239. The next prime is 1240134251. The reversal of 1240134243 is 3424310421.

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 1240134243 - 2² = 1240134239 is a prime.

It is a super-2 number, since 2×1240134243² = 3075865881322366098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1240134253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206689038 + ... + 206689043.

It is an arithmetic number, because the mean of its divisors is an integer number (413378082).

Almost surely, 2^1240134243 is an apocalyptic number.

1240134243 is a deficient number, since it is larger than the sum of its proper divisors (413378085).

1240134243 is an equidigital number, since it uses as much as digits as its factorization.

1240134243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413378084.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 1240134243 is about 35215.5397942442. The cubic root of 1240134243 is about 1074.3758390070.

Adding to 1240134243 its reverse (3424310421), we get a palindrome (4664444664).

The spelling of 1240134243 in words is "one billion, two hundred forty million, one hundred thirty-four thousand, two hundred forty-three".