42439247 has 2 divisors, whose sum is σ = 42439248. Its totient is φ = 42439246.

The previous prime is 42439219. The next prime is 42439249. The reversal of 42439247 is 74293424.

42439247 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 a de Polignac number, because none of the positive numbers 2^k-42439247 is a prime.

Together with 42439249, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42439249) 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, 21219623 + 21219624.

It is an arithmetic number, because the mean of its divisors is an integer number (21219624).

Almost surely, 2^42439247 is an apocalyptic number.

42439247 is a deficient number, since it is larger than the sum of its proper divisors (1).

42439247 is an equidigital number, since it uses as much as digits as its factorization.

42439247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 35.

The square root of 42439247 is about 6514.5411964313. The cubic root of 42439247 is about 348.8102377503.

The spelling of 42439247 in words is "forty-two million, four hundred thirty-nine thousand, two hundred forty-seven".