128071929 has 4 divisors (see below), whose sum is σ = 170762576. Its totient is φ = 85381284.

The previous prime is 128071927. The next prime is 128071961. The reversal of 128071929 is 929170821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 929170821 = 3 ⋅309723607.

It is not a de Polignac number, because 128071929 - 2¹ = 128071927 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128071921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21345319 + ... + 21345324.

It is an arithmetic number, because the mean of its divisors is an integer number (42690644).

Almost surely, 2^128071929 is an apocalyptic number.

It is an amenable number.

128071929 is a deficient number, since it is larger than the sum of its proper divisors (42690647).

128071929 is an equidigital number, since it uses as much as digits as its factorization.

128071929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42690646.

The product of its (nonzero) digits is 18144, while the sum is 39.

The square root of 128071929 is about 11316.8868952552. The cubic root of 128071929 is about 504.0628031778.

The spelling of 128071929 in words is "one hundred twenty-eight million, seventy-one thousand, nine hundred twenty-nine".