4218439 has 2 divisors, whose sum is σ = 4218440. Its totient is φ = 4218438.

The previous prime is 4218413. The next prime is 4218463. The reversal of 4218439 is 9348124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4218439 - 2¹³ = 4210247 is a prime.

4218439 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 4218439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4218469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2109219 + 2109220.

It is an arithmetic number, because the mean of its divisors is an integer number (2109220).

Almost surely, 2^4218439 is an apocalyptic number.

4218439 is a deficient number, since it is larger than the sum of its proper divisors (1).

4218439 is an equidigital number, since it uses as much as digits as its factorization.

4218439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 31.

The square root of 4218439 is about 2053.8838818200. The cubic root of 4218439 is about 161.5786311115.

It can be divided in two parts, 42 and 18439, that added together give a palindrome (18481).

The spelling of 4218439 in words is "four million, two hundred eighteen thousand, four hundred thirty-nine".