1240042305 has 16 divisors (see below), whose sum is σ = 2100777984. Its totient is φ = 622452480.

The previous prime is 1240042303. The next prime is 1240042333. The reversal of 1240042305 is 5032400421.

It is not a de Polignac number, because 1240042305 - 2¹ = 1240042303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1240042303) 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, 2431201 + ... + 2431710.

It is an arithmetic number, because the mean of its divisors is an integer number (131298624).

Almost surely, 2^1240042305 is an apocalyptic number.

1240042305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1240042305 is a deficient number, since it is larger than the sum of its proper divisors (860735679).

1240042305 is a wasteful number, since it uses less digits than its factorization.

1240042305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4862936.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 1240042305 is about 35214.2344088296. The cubic root of 1240042305 is about 1074.3492885462.

Adding to 1240042305 its reverse (5032400421), we get a palindrome (6272442726).

The spelling of 1240042305 in words is "one billion, two hundred forty million, forty-two thousand, three hundred five".