42390071 has 2 divisors, whose sum is σ = 42390072. Its totient is φ = 42390070.

The previous prime is 42390043. The next prime is 42390097. The reversal of 42390071 is 17009324.

42390071 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (42390097) can be obtained adding 42390071 to its sum of digits (26).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42390071 - 2¹⁰ = 42389047 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42390071.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42390001) 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, 21195035 + 21195036.

It is an arithmetic number, because the mean of its divisors is an integer number (21195036).

Almost surely, 2^42390071 is an apocalyptic number.

42390071 is a deficient number, since it is larger than the sum of its proper divisors (1).

42390071 is an equidigital number, since it uses as much as digits as its factorization.

42390071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 42390071 is about 6510.7657767731. The cubic root of 42390071 is about 348.6754590329.

Adding to 42390071 its reverse (17009324), we get a palindrome (59399395).

The spelling of 42390071 in words is "forty-two million, three hundred ninety thousand, seventy-one".