128407739 has 2 divisors, whose sum is σ = 128407740. Its totient is φ = 128407738.

The previous prime is 128407729. The next prime is 128407759. The reversal of 128407739 is 937704821.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128407739 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128407696 and 128407705.

It is not a weakly prime, because it can be changed into another prime (128407729) 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, 64203869 + 64203870.

It is an arithmetic number, because the mean of its divisors is an integer number (64203870).

Almost surely, 2^128407739 is an apocalyptic number.

128407739 is a deficient number, since it is larger than the sum of its proper divisors (1).

128407739 is an equidigital number, since it uses as much as digits as its factorization.

128407739 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 128407739 is about 11331.7138597831. The cubic root of 128407739 is about 504.5029766611.

The spelling of 128407739 in words is "one hundred twenty-eight million, four hundred seven thousand, seven hundred thirty-nine".