128348639 has 2 divisors, whose sum is σ = 128348640. Its totient is φ = 128348638.

The previous prime is 128348567. The next prime is 128348651. The reversal of 128348639 is 936843821.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128348639 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128348639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128348839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64174319 + 64174320.

It is an arithmetic number, because the mean of its divisors is an integer number (64174320).

Almost surely, 2^128348639 is an apocalyptic number.

128348639 is a deficient number, since it is larger than the sum of its proper divisors (1).

128348639 is an equidigital number, since it uses as much as digits as its factorization.

128348639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 44.

The square root of 128348639 is about 11329.1058340895. The cubic root of 128348639 is about 504.4255651758.

The spelling of 128348639 in words is "one hundred twenty-eight million, three hundred forty-eight thousand, six hundred thirty-nine".