128839946 has 8 divisors (see below), whose sum is σ = 193450464. Its totient is φ = 64356460.

The previous prime is 128839939. The next prime is 128839961. The reversal of 128839946 is 649938821.

It is a happy number.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 128839894 and 128839903.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29180 + ... + 33303.

It is an arithmetic number, because the mean of its divisors is an integer number (24181308).

Almost surely, 2^128839946 is an apocalyptic number.

128839946 is a deficient number, since it is larger than the sum of its proper divisors (64610518).

128839946 is a wasteful number, since it uses less digits than its factorization.

128839946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63516.

The product of its digits is 746496, while the sum is 50.

The square root of 128839946 is about 11350.7685202369. The cubic root of 128839946 is about 505.0683775007.

The spelling of 128839946 in words is "one hundred twenty-eight million, eight hundred thirty-nine thousand, nine hundred forty-six".