128842709 has 8 divisors (see below), whose sum is σ = 129796992. Its totient is φ = 127892320.

The previous prime is 128842699. The next prime is 128842717. The reversal of 128842709 is 907248821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128842709 - 2¹² = 128838613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128842729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99782 + ... + 101064.

It is an arithmetic number, because the mean of its divisors is an integer number (16224624).

Almost surely, 2^128842709 is an apocalyptic number.

It is an amenable number.

128842709 is a deficient number, since it is larger than the sum of its proper divisors (954283).

128842709 is a wasteful number, since it uses less digits than its factorization.

128842709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1947.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 128842709 is about 11350.8902294049. The cubic root of 128842709 is about 505.0719879077.

The spelling of 128842709 in words is "one hundred twenty-eight million, eight hundred forty-two thousand, seven hundred nine".