128319739 has 2 divisors, whose sum is σ = 128319740. Its totient is φ = 128319738.

The previous prime is 128319733. The next prime is 128319767. The reversal of 128319739 is 937913821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128319739 - 2⁵ = 128319707 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128319695 and 128319704.

It is not a weakly prime, because it can be changed into another prime (128319733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64159869 + 64159870.

It is an arithmetic number, because the mean of its divisors is an integer number (64159870).

Almost surely, 2^128319739 is an apocalyptic number.

128319739 is a deficient number, since it is larger than the sum of its proper divisors (1).

128319739 is an equidigital number, since it uses as much as digits as its factorization.

128319739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 43.

The square root of 128319739 is about 11327.8302865112. The cubic root of 128319739 is about 504.3877021769.

The spelling of 128319739 in words is "one hundred twenty-eight million, three hundred nineteen thousand, seven hundred thirty-nine".