128004129 has 12 divisors (see below), whose sum is σ = 201703632. Its totient is φ = 77578200.

The previous prime is 128004119. The next prime is 128004139. The reversal of 128004129 is 921400821.

It is an interprime number because it is at equal distance from previous prime (128004119) and next prime (128004139).

It is not a de Polignac number, because 128004129 - 2¹¹ = 128002081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128004109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 646387 + ... + 646584.

It is an arithmetic number, because the mean of its divisors is an integer number (16808636).

Almost surely, 2^128004129 is an apocalyptic number.

It is an amenable number.

128004129 is a deficient number, since it is larger than the sum of its proper divisors (73699503).

128004129 is a wasteful number, since it uses less digits than its factorization.

128004129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1292988 (or 1292985 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 128004129 is about 11313.8909752569. The cubic root of 128004129 is about 503.9738388726.

The spelling of 128004129 in words is "one hundred twenty-eight million, four thousand, one hundred twenty-nine".