398339839 has 2 divisors, whose sum is σ = 398339840. Its totient is φ = 398339838.

The previous prime is 398339833. The next prime is 398339849. The reversal of 398339839 is 938933893.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 398339839 - 2¹¹ = 398337791 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 398339839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398339833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199169919 + 199169920.

It is an arithmetic number, because the mean of its divisors is an integer number (199169920).

Almost surely, 2^398339839 is an apocalyptic number.

398339839 is a deficient number, since it is larger than the sum of its proper divisors (1).

398339839 is an equidigital number, since it uses as much as digits as its factorization.

398339839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3779136, while the sum is 55.

The square root of 398339839 is about 19958.4528207975. The cubic root of 398339839 is about 735.7855386637.

The spelling of 398339839 in words is "three hundred ninety-eight million, three hundred thirty-nine thousand, eight hundred thirty-nine".