128786241 has 4 divisors (see below), whose sum is σ = 171714992. Its totient is φ = 85857492.

The previous prime is 128786209. The next prime is 128786243. The reversal of 128786241 is 142687821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 128786241 - 2⁵ = 128786209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128786241.

It is not an unprimeable number, because it can be changed into a prime (128786243) 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, 21464371 + ... + 21464376.

It is an arithmetic number, because the mean of its divisors is an integer number (42928748).

Almost surely, 2^128786241 is an apocalyptic number.

It is an amenable number.

128786241 is a deficient number, since it is larger than the sum of its proper divisors (42928751).

128786241 is an equidigital number, since it uses as much as digits as its factorization.

128786241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42928750.

The product of its digits is 43008, while the sum is 39.

The square root of 128786241 is about 11348.4025748120. The cubic root of 128786241 is about 504.9981910205.

The spelling of 128786241 in words is "one hundred twenty-eight million, seven hundred eighty-six thousand, two hundred forty-one".