42216439 has 2 divisors, whose sum is σ = 42216440. Its totient is φ = 42216438.

The previous prime is 42216407. The next prime is 42216467. The reversal of 42216439 is 93461224.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42216439 - 2⁵ = 42216407 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 42216439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42216469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21108219 + 21108220.

It is an arithmetic number, because the mean of its divisors is an integer number (21108220).

Almost surely, 2^42216439 is an apocalyptic number.

42216439 is a deficient number, since it is larger than the sum of its proper divisors (1).

42216439 is an equidigital number, since it uses as much as digits as its factorization.

42216439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 31.

The square root of 42216439 is about 6497.4178717395. The cubic root of 42216439 is about 348.1987431061.

It can be divided in two parts, 422 and 16439, that added together give a palindrome (16861).

The spelling of 42216439 in words is "forty-two million, two hundred sixteen thousand, four hundred thirty-nine".