128863841 has 4 divisors (see below), whose sum is σ = 128970432. Its totient is φ = 128757252.

The previous prime is 128863837. The next prime is 128863877. The reversal of 128863841 is 148368821.

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, and also an emirpimes, since its reverse is a distinct semiprime: 148368821 = 31 ⋅4786091.

It is a cyclic number.

It is not a de Polignac number, because 128863841 - 2² = 128863837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (128863811) 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, 51461 + ... + 53906.

It is an arithmetic number, because the mean of its divisors is an integer number (32242608).

Almost surely, 2^128863841 is an apocalyptic number.

It is an amenable number.

128863841 is a deficient number, since it is larger than the sum of its proper divisors (106591).

128863841 is a wasteful number, since it uses less digits than its factorization.

128863841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106590.

The product of its digits is 73728, while the sum is 41.

The square root of 128863841 is about 11351.8210433393. The cubic root of 128863841 is about 505.0995993467.

The spelling of 128863841 in words is "one hundred twenty-eight million, eight hundred sixty-three thousand, eight hundred forty-one".