42816439 has 2 divisors, whose sum is σ = 42816440. Its totient is φ = 42816438.

The previous prime is 42816419. The next prime is 42816451. The reversal of 42816439 is 93461824.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42816439 - 2⁵ = 42816407 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42816398 and 42816407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42816419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21408219 + 21408220.

It is an arithmetic number, because the mean of its divisors is an integer number (21408220).

Almost surely, 2^42816439 is an apocalyptic number.

42816439 is a deficient number, since it is larger than the sum of its proper divisors (1).

42816439 is an equidigital number, since it uses as much as digits as its factorization.

42816439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 37.

The square root of 42816439 is about 6543.4271601356. The cubic root of 42816439 is about 349.8405777356.

The spelling of 42816439 in words is "forty-two million, eight hundred sixteen thousand, four hundred thirty-nine".