128140939 has 2 divisors, whose sum is σ = 128140940. Its totient is φ = 128140938.

The previous prime is 128140891. The next prime is 128140973. The reversal of 128140939 is 939041821.

It is a strong prime.

It is an emirp because it is prime and its reverse (939041821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128140939 - 2¹¹ = 128138891 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128140898 and 128140907.

It is not a weakly prime, because it can be changed into another prime (128146939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64070469 + 64070470.

It is an arithmetic number, because the mean of its divisors is an integer number (64070470).

Almost surely, 2^128140939 is an apocalyptic number.

128140939 is a deficient number, since it is larger than the sum of its proper divisors (1).

128140939 is an equidigital number, since it uses as much as digits as its factorization.

128140939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 128140939 is about 11319.9354680139. The cubic root of 128140939 is about 504.1533229566.

The spelling of 128140939 in words is "one hundred twenty-eight million, one hundred forty thousand, nine hundred thirty-nine".