128869941 has 4 divisors (see below), whose sum is σ = 171826592. Its totient is φ = 85913292.

The previous prime is 128869933. The next prime is 128869963. The reversal of 128869941 is 149968821.

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 128869941 - 2³ = 128869933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128869921) 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, 21478321 + ... + 21478326.

It is an arithmetic number, because the mean of its divisors is an integer number (42956648).

Almost surely, 2^128869941 is an apocalyptic number.

It is an amenable number.

128869941 is a deficient number, since it is larger than the sum of its proper divisors (42956651).

128869941 is an equidigital number, since it uses as much as digits as its factorization.

128869941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42956650.

The product of its digits is 248832, while the sum is 48.

The square root of 128869941 is about 11352.0897195186. The cubic root of 128869941 is about 505.1075691514.

The spelling of 128869941 in words is "one hundred twenty-eight million, eight hundred sixty-nine thousand, nine hundred forty-one".