42207839 has 2 divisors, whose sum is σ = 42207840. Its totient is φ = 42207838.

The previous prime is 42207827. The next prime is 42207853. The reversal of 42207839 is 93870224.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42207839 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42207799 and 42207808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42207859) 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, 21103919 + 21103920.

It is an arithmetic number, because the mean of its divisors is an integer number (21103920).

Almost surely, 2^42207839 is an apocalyptic number.

42207839 is a deficient number, since it is larger than the sum of its proper divisors (1).

42207839 is an equidigital number, since it uses as much as digits as its factorization.

42207839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 42207839 is about 6496.7560366694. The cubic root of 42207839 is about 348.1750973998.

The spelling of 42207839 in words is "forty-two million, two hundred seven thousand, eight hundred thirty-nine".