128336839 has 2 divisors, whose sum is σ = 128336840. Its totient is φ = 128336838.

The previous prime is 128336833. The next prime is 128336851. The reversal of 128336839 is 938633821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128336839 - 2¹⁹ = 127812551 is a prime.

It is a super-4 number, since 4×128336839⁴ (a number of 34 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 128336795 and 128336804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128336833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64168419 + 64168420.

It is an arithmetic number, because the mean of its divisors is an integer number (64168420).

Almost surely, 2^128336839 is an apocalyptic number.

128336839 is a deficient number, since it is larger than the sum of its proper divisors (1).

128336839 is an equidigital number, since it uses as much as digits as its factorization.

128336839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 43.

The square root of 128336839 is about 11328.5850396243. The cubic root of 128336839 is about 504.4101062297.

The spelling of 128336839 in words is "one hundred twenty-eight million, three hundred thirty-six thousand, eight hundred thirty-nine".