42820073 has 4 divisors (see below), whose sum is σ = 42840720. Its totient is φ = 42799428.

The previous prime is 42820069. The next prime is 42820079. The reversal of 42820073 is 37002824.

42820073 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42820073 - 2² = 42820069 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42820079) 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, 6815 + ... + 11492.

It is an arithmetic number, because the mean of its divisors is an integer number (10710180).

Almost surely, 2^42820073 is an apocalyptic number.

It is an amenable number.

42820073 is a deficient number, since it is larger than the sum of its proper divisors (20647).

42820073 is a wasteful number, since it uses less digits than its factorization.

42820073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20646.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 42820073 is about 6543.7048374755. The cubic root of 42820073 is about 349.8504749053.

Adding to 42820073 its reverse (37002824), we get a palindrome (79822897).

The spelling of 42820073 in words is "forty-two million, eight hundred twenty thousand, seventy-three".