618439 has 2 divisors, whose sum is σ = 618440. Its totient is φ = 618438.

The previous prime is 618437. The next prime is 618463. The reversal of 618439 is 934816.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 618439 - 2¹ = 618437 is a prime.

Together with 618437, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 618439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (618437) 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, 309219 + 309220.

It is an arithmetic number, because the mean of its divisors is an integer number (309220).

2⁶¹⁸⁴³⁹ is an apocalyptic number.

618439 is a deficient number, since it is larger than the sum of its proper divisors (1).

618439 is an equidigital number, since it uses as much as digits as its factorization.

618439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 31.

The square root of 618439 is about 786.4089267042. The cubic root of 618439 is about 85.1985669122.

The spelling of 618439 in words is "six hundred eighteen thousand, four hundred thirty-nine".