42240447 has 14 divisors (see below), whose sum is σ = 63332792. Its totient is φ = 28159812.

The previous prime is 42240433. The next prime is 42240463. The reversal of 42240447 is 74404224.

42240447 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42240447 - 2¹⁵ = 42207679 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a nialpdrome in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 42240447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42240467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 28243 + ... + 29700.

Almost surely, 2^42240447 is an apocalyptic number.

42240447 is a deficient number, since it is larger than the sum of its proper divisors (21092345).

42240447 is an frugal number, since it uses more digits than its factorization.

42240447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57961 (or 57946 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 27.

The square root of 42240447 is about 6499.2651123031. The cubic root of 42240447 is about 348.2647361289.

The spelling of 42240447 in words is "forty-two million, two hundred forty thousand, four hundred forty-seven".