128820039 has 8 divisors (see below), whose sum is σ = 171934320. Its totient is φ = 85792896.

The previous prime is 128820031. The next prime is 128820071. The reversal of 128820039 is 930028821.

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

It is not a de Polignac number, because 128820039 - 2³ = 128820031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128819991 and 128820009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128820031) 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, 18252 + ... + 24305.

It is an arithmetic number, because the mean of its divisors is an integer number (21491790).

Almost surely, 2^128820039 is an apocalyptic number.

128820039 is a deficient number, since it is larger than the sum of its proper divisors (43114281).

128820039 is a wasteful number, since it uses less digits than its factorization.

128820039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43569.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 128820039 is about 11349.8915853853. The cubic root of 128820039 is about 505.0423635343.

The spelling of 128820039 in words is "one hundred twenty-eight million, eight hundred twenty thousand, thirty-nine".