240040431209989 has 2 divisors, whose sum is σ = 240040431209990. Its totient is φ = 240040431209988.

The previous prime is 240040431209987. The next prime is 240040431210071. The reversal of 240040431209989 is 989902134040042.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 238480535124225 + 1559896085764 = 15442815^2 + 1248958^2 .

It is a cyclic number.

It is not a de Polignac number, because 240040431209989 - 2¹ = 240040431209987 is a prime.

It is a super-2 number, since 2×240040431209989² (a number of 30 digits) contains 22 as substring.

Together with 240040431209987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (240040431209987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120020215604994 + 120020215604995.

It is an arithmetic number, because the mean of its divisors is an integer number (120020215604995).

Almost surely, 2^{240040431209989} is an apocalyptic number.

It is an amenable number.

240040431209989 is a deficient number, since it is larger than the sum of its proper divisors (1).

240040431209989 is an equidigital number, since it uses as much as digits as its factorization.

240040431209989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4478976, while the sum is 55.

The spelling of 240040431209989 in words is "two hundred forty trillion, forty billion, four hundred thirty-one million, two hundred nine thousand, nine hundred eighty-nine".