128165042 has 8 divisors (see below), whose sum is σ = 192297132. Its totient is φ = 64066000.

The previous prime is 128165027. The next prime is 128165047. The reversal of 128165042 is 240561821.

It is a Cunningham number, because it is equal to 11321²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 128165041 + 1 = 11321^2 + 1^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 128164996 and 128165014.

It is not an unprimeable number, because it can be changed into a prime (128165047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7292 + ... + 17592.

Almost surely, 2^128165042 is an apocalyptic number.

128165042 is a deficient number, since it is larger than the sum of its proper divisors (64132090).

128165042 is a wasteful number, since it uses less digits than its factorization.

128165042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16524.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 128165042 is about 11321.0000441657. Note that the first 4 decimals coincide. The cubic root of 128165042 is about 504.1849309808.

The spelling of 128165042 in words is "one hundred twenty-eight million, one hundred sixty-five thousand, forty-two".