128951889 has 16 divisors (see below), whose sum is σ = 188697600. Its totient is φ = 77681360.

The previous prime is 128951873. The next prime is 128951891. The reversal of 128951889 is 988159821.

It is a cyclic number.

It is not a de Polignac number, because 128951889 - 2⁴ = 128951873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128951189) 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, 6189 + ... + 17210.

It is an arithmetic number, because the mean of its divisors is an integer number (11793600).

Almost surely, 2^128951889 is an apocalyptic number.

It is an amenable number.

128951889 is a deficient number, since it is larger than the sum of its proper divisors (59745711).

128951889 is a wasteful number, since it uses less digits than its factorization.

128951889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23580.

The product of its digits is 414720, while the sum is 51.

The square root of 128951889 is about 11355.6985254101. The cubic root of 128951889 is about 505.2146119163.

The spelling of 128951889 in words is "one hundred twenty-eight million, nine hundred fifty-one thousand, eight hundred eighty-nine".