128061939 has 8 divisors (see below), whose sum is σ = 173971152. Its totient is φ = 83763680.

The previous prime is 128061931. The next prime is 128061949. The reversal of 128061939 is 939160821.

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 128061939 - 2³ = 128061931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128061897 and 128061906.

It is not an unprimeable number, because it can be changed into a prime (128061931) 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, 402552 + ... + 402869.

It is an arithmetic number, because the mean of its divisors is an integer number (21746394).

Almost surely, 2^128061939 is an apocalyptic number.

128061939 is a deficient number, since it is larger than the sum of its proper divisors (45909213).

128061939 is an equidigital number, since it uses as much as digits as its factorization.

128061939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805477.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 128061939 is about 11316.4455108484. The cubic root of 128061939 is about 504.0496966931.

The spelling of 128061939 in words is "one hundred twenty-eight million, sixty-one thousand, nine hundred thirty-nine".