128169946 has 4 divisors (see below), whose sum is σ = 192254922. Its totient is φ = 64084972.

The previous prime is 128169931. The next prime is 128169947. The reversal of 128169946 is 649961821.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 103815721 + 24354225 = 10189^2 + 4935^2 .

It is a junction number, because it is equal to n+sod(n) for n = 128169896 and 128169905.

It is not an unprimeable number, because it can be changed into a prime (128169947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32042485 + ... + 32042488.

Almost surely, 2^128169946 is an apocalyptic number.

128169946 is a deficient number, since it is larger than the sum of its proper divisors (64084976).

128169946 is an equidigital number, since it uses as much as digits as its factorization.

128169946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64084975.

The product of its digits is 186624, while the sum is 46.

The square root of 128169946 is about 11321.2166307336. The cubic root of 128169946 is about 504.1913614690.

The spelling of 128169946 in words is "one hundred twenty-eight million, one hundred sixty-nine thousand, nine hundred forty-six".