1240243311 has 8 divisors (see below), whose sum is σ = 1668829360. Its totient is φ = 819243072.

The previous prime is 1240243309. The next prime is 1240243321. The reversal of 1240243311 is 1133420421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1240243311 - 2¹ = 1240243309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240243321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1896070 + ... + 1896723.

It is an arithmetic number, because the mean of its divisors is an integer number (208603670).

Almost surely, 2^1240243311 is an apocalyptic number.

1240243311 is a deficient number, since it is larger than the sum of its proper divisors (428586049).

1240243311 is a wasteful number, since it uses less digits than its factorization.

1240243311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3792905.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1240243311 is about 35217.0883379078. The cubic root of 1240243311 is about 1074.4073346803.

Adding to 1240243311 its reverse (1133420421), we get a palindrome (2373663732).

The spelling of 1240243311 in words is "one billion, two hundred forty million, two hundred forty-three thousand, three hundred eleven".