128440041 has 16 divisors (see below), whose sum is σ = 176109120. Its totient is φ = 83229120.

The previous prime is 128440021. The next prime is 128440063. The reversal of 128440041 is 140044821.

It is not a de Polignac number, because 128440041 - 2⁶ = 128439977 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128439993 and 128440020.

It is not an unprimeable number, because it can be changed into a prime (128440021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13626 + ... + 21036.

It is an arithmetic number, because the mean of its divisors is an integer number (11006820).

Almost surely, 2^128440041 is an apocalyptic number.

It is an amenable number.

128440041 is a deficient number, since it is larger than the sum of its proper divisors (47669079).

128440041 is a wasteful number, since it uses less digits than its factorization.

128440041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7576.

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 128440041 is about 11333.1390620604. The cubic root of 128440041 is about 504.5452770421.

Adding to 128440041 its reverse (140044821), we get a palindrome (268484862).

The spelling of 128440041 in words is "one hundred twenty-eight million, four hundred forty thousand, forty-one".