42042823 has 2 divisors, whose sum is σ = 42042824. Its totient is φ = 42042822.

The previous prime is 42042821. The next prime is 42042829. The reversal of 42042823 is 32824024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42042823 - 2¹ = 42042821 is a prime.

Together with 42042821, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42042821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21021411 + 21021412.

It is an arithmetic number, because the mean of its divisors is an integer number (21021412).

Almost surely, 2^42042823 is an apocalyptic number.

42042823 is a deficient number, since it is larger than the sum of its proper divisors (1).

42042823 is an equidigital number, since it uses as much as digits as its factorization.

42042823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 42042823 is about 6484.0437228631. The cubic root of 42042823 is about 347.7207623675.

Adding to 42042823 its reverse (32824024), we get a palindrome (74866847).

The spelling of 42042823 in words is "forty-two million, forty-two thousand, eight hundred twenty-three".