42147239 has 2 divisors, whose sum is σ = 42147240. Its totient is φ = 42147238.

The previous prime is 42147227. The next prime is 42147241. The reversal of 42147239 is 93274124.

42147239 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42147239 - 2²⁰ = 41098663 is a prime.

Together with 42147241, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42147269) 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, 21073619 + 21073620.

It is an arithmetic number, because the mean of its divisors is an integer number (21073620).

Almost surely, 2^42147239 is an apocalyptic number.

42147239 is a deficient number, since it is larger than the sum of its proper divisors (1).

42147239 is an equidigital number, since it uses as much as digits as its factorization.

42147239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 32.

The square root of 42147239 is about 6492.0904953643. The cubic root of 42147239 is about 348.0083865289.

The spelling of 42147239 in words is "forty-two million, one hundred forty-seven thousand, two hundred thirty-nine".