42106643 has 4 divisors (see below), whose sum is σ = 42350208. Its totient is φ = 41863080.

The previous prime is 42106613. The next prime is 42106657. The reversal of 42106643 is 34660124.

42106643 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 not a de Polignac number, because 42106643 - 2⁸ = 42106387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42106613) 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, 121523 + ... + 121868.

It is an arithmetic number, because the mean of its divisors is an integer number (10587552).

Almost surely, 2^42106643 is an apocalyptic number.

42106643 is a deficient number, since it is larger than the sum of its proper divisors (243565).

42106643 is a wasteful number, since it uses less digits than its factorization.

42106643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243564.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 42106643 is about 6488.9631683344. The cubic root of 42106643 is about 347.8966173505.

Adding to 42106643 its reverse (34660124), we get a palindrome (76766767).

The spelling of 42106643 in words is "forty-two million, one hundred six thousand, six hundred forty-three".