42897643 has 4 divisors (see below), whose sum is σ = 42965208. Its totient is φ = 42830080.

The previous prime is 42897623. The next prime is 42897671. The reversal of 42897643 is 34679824.

42897643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42897643 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42897643.

It is not an unprimeable number, because it can be changed into a prime (42897623) 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 3 ways as a sum of consecutive naturals, for example, 32821 + ... + 34102.

It is an arithmetic number, because the mean of its divisors is an integer number (10741302).

Almost surely, 2^42897643 is an apocalyptic number.

42897643 is a deficient number, since it is larger than the sum of its proper divisors (67565).

42897643 is an equidigital number, since it uses as much as digits as its factorization.

42897643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67564.

The product of its digits is 290304, while the sum is 43.

The square root of 42897643 is about 6549.6292261471. The cubic root of 42897643 is about 350.0616027622.

The spelling of 42897643 in words is "forty-two million, eight hundred ninety-seven thousand, six hundred forty-three".