128195947 has 8 divisors (see below), whose sum is σ = 140857920. Its totient is φ = 115701960.

The previous prime is 128195927. The next prime is 128195987. The reversal of 128195947 is 749591821.

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

It is a de Polignac number, because none of the positive numbers 2^k-128195947 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128195897 and 128195906.

It is not an unprimeable number, because it can be changed into a prime (128195927) 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, 40393 + ... + 43450.

It is an arithmetic number, because the mean of its divisors is an integer number (17607240).

Almost surely, 2^128195947 is an apocalyptic number.

128195947 is a deficient number, since it is larger than the sum of its proper divisors (12661973).

128195947 is a wasteful number, since it uses less digits than its factorization.

128195947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83993.

The product of its digits is 181440, while the sum is 46.

The square root of 128195947 is about 11322.3649031463. The cubic root of 128195947 is about 504.2254531669.

The spelling of 128195947 in words is "one hundred twenty-eight million, one hundred ninety-five thousand, nine hundred forty-seven".