1240743139 has 2 divisors, whose sum is σ = 1240743140. Its totient is φ = 1240743138.

The previous prime is 1240743071. The next prime is 1240743157. The reversal of 1240743139 is 9313470421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1240743139 - 2¹³ = 1240734947 is a prime.

It is not a weakly prime, because it can be changed into another prime (1240743169) 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 as a sum of consecutive naturals, namely, 620371569 + 620371570.

It is an arithmetic number, because the mean of its divisors is an integer number (620371570).

Almost surely, 2^1240743139 is an apocalyptic number.

1240743139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240743139 is an equidigital number, since it uses as much as digits as its factorization.

1240743139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 1240743139 is about 35224.1840075821. The cubic root of 1240743139 is about 1074.5516468863.

The spelling of 1240743139 in words is "one billion, two hundred forty million, seven hundred forty-three thousand, one hundred thirty-nine".