42440406806447 has 4 divisors (see below), whose sum is σ = 45705053483880. Its totient is φ = 39175760129016.

The previous prime is 42440406806431. The next prime is 42440406806503. The reversal of 42440406806447 is 74460860404424.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42440406806447 - 2⁴ = 42440406806431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42440406806047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1632323338697 + ... + 1632323338722.

It is an arithmetic number, because the mean of its divisors is an integer number (11426263370970).

Almost surely, 2^{42440406806447} is an apocalyptic number.

42440406806447 is a deficient number, since it is larger than the sum of its proper divisors (3264646677433).

42440406806447 is a wasteful number, since it uses less digits than its factorization.

42440406806447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3264646677432.

The product of its (nonzero) digits is 16515072, while the sum is 53.

The spelling of 42440406806447 in words is "forty-two trillion, four hundred forty billion, four hundred six million, eight hundred six thousand, four hundred forty-seven".