240312139 has 2 divisors, whose sum is σ = 240312140. Its totient is φ = 240312138.

The previous prime is 240312109. The next prime is 240312157. The reversal of 240312139 is 931213042.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 240312139 - 2⁷ = 240312011 is a prime.

It is not a weakly prime, because it can be changed into another prime (240312109) 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, 120156069 + 120156070.

It is an arithmetic number, because the mean of its divisors is an integer number (120156070).

Almost surely, 2^240312139 is an apocalyptic number.

240312139 is a deficient number, since it is larger than the sum of its proper divisors (1).

240312139 is an equidigital number, since it uses as much as digits as its factorization.

240312139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 240312139 is about 15502.0043542763. The cubic root of 240312139 is about 621.7157979348.

The spelling of 240312139 in words is "two hundred forty million, three hundred twelve thousand, one hundred thirty-nine".