128145839 has 2 divisors, whose sum is σ = 128145840. Its totient is φ = 128145838.

The previous prime is 128145833. The next prime is 128145859. The reversal of 128145839 is 938541821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128145839 - 2¹² = 128141743 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 128145796 and 128145805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128145833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64072919 + 64072920.

It is an arithmetic number, because the mean of its divisors is an integer number (64072920).

Almost surely, 2^128145839 is an apocalyptic number.

128145839 is a deficient number, since it is larger than the sum of its proper divisors (1).

128145839 is an equidigital number, since it uses as much as digits as its factorization.

128145839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 41.

The square root of 128145839 is about 11320.1518982742. The cubic root of 128145839 is about 504.1597490054.

The spelling of 128145839 in words is "one hundred twenty-eight million, one hundred forty-five thousand, eight hundred thirty-nine".