42000643 has 4 divisors (see below), whose sum is σ = 42386080. Its totient is φ = 41615208.

The previous prime is 42000611. The next prime is 42000649. The reversal of 42000643 is 34600024.

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 42000643 - 2⁵ = 42000611 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 42000643.

It is not an unprimeable number, because it can be changed into a prime (42000649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192555 + ... + 192772.

It is an arithmetic number, because the mean of its divisors is an integer number (10596520).

Almost surely, 2^42000643 is an apocalyptic number.

42000643 is a deficient number, since it is larger than the sum of its proper divisors (385437).

42000643 is a wasteful number, since it uses less digits than its factorization.

42000643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385436.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 42000643 is about 6480.7903067450. The cubic root of 42000643 is about 347.6044383567.

Adding to 42000643 its reverse (34600024), we get a palindrome (76600667).

The spelling of 42000643 in words is "forty-two million, six hundred forty-three", and thus it is an aban number.