128672839 has 2 divisors, whose sum is σ = 128672840. Its totient is φ = 128672838.

The previous prime is 128672837. The next prime is 128672857. The reversal of 128672839 is 938276821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128672839 - 2¹ = 128672837 is a prime.

Together with 128672837, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128672837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64336419 + 64336420.

It is an arithmetic number, because the mean of its divisors is an integer number (64336420).

Almost surely, 2^128672839 is an apocalyptic number.

128672839 is a deficient number, since it is larger than the sum of its proper divisors (1).

128672839 is an equidigital number, since it uses as much as digits as its factorization.

128672839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 46.

The square root of 128672839 is about 11343.4050884203. The cubic root of 128672839 is about 504.8499230545.

The spelling of 128672839 in words is "one hundred twenty-eight million, six hundred seventy-two thousand, eight hundred thirty-nine".