42405240989 has 2 divisors, whose sum is σ = 42405240990. Its totient is φ = 42405240988.

The previous prime is 42405240979. The next prime is 42405241051. The reversal of 42405240989 is 98904250424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40740192964 + 1665048025 = 201842^2 + 40805^2 .

It is a cyclic number.

It is not a de Polignac number, because 42405240989 - 2⁸ = 42405240733 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42405240979) 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, 21202620494 + 21202620495.

It is an arithmetic number, because the mean of its divisors is an integer number (21202620495).

Almost surely, 2^42405240989 is an apocalyptic number.

It is an amenable number.

42405240989 is a deficient number, since it is larger than the sum of its proper divisors (1).

42405240989 is an equidigital number, since it uses as much as digits as its factorization.

42405240989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 829440, while the sum is 47.

The spelling of 42405240989 in words is "forty-two billion, four hundred five million, two hundred forty thousand, nine hundred eighty-nine".