42820423 has 2 divisors, whose sum is σ = 42820424. Its totient is φ = 42820422.

The previous prime is 42820409. The next prime is 42820451. The reversal of 42820423 is 32402824.

42820423 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42820423 - 2⁵ = 42820391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42820403) 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 as a sum of consecutive naturals, namely, 21410211 + 21410212.

It is an arithmetic number, because the mean of its divisors is an integer number (21410212).

Almost surely, 2^42820423 is an apocalyptic number.

42820423 is a deficient number, since it is larger than the sum of its proper divisors (1).

42820423 is an equidigital number, since it uses as much as digits as its factorization.

42820423 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 42820423 is about 6543.7315806809. The cubic root of 42820423 is about 349.8514280979.

The spelling of 42820423 in words is "forty-two million, eight hundred twenty thousand, four hundred twenty-three".