128955893 has 4 divisors (see below), whose sum is σ = 140679168. Its totient is φ = 117232620.

The previous prime is 128955889. The next prime is 128955899. The reversal of 128955893 is 398559821.

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: 398559821 = 11 ⋅36232711.

It is a cyclic number.

It is not a de Polignac number, because 128955893 - 2² = 128955889 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 (128955899) 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, 5861621 + ... + 5861642.

It is an arithmetic number, because the mean of its divisors is an integer number (35169792).

Almost surely, 2^128955893 is an apocalyptic number.

It is an amenable number.

128955893 is a deficient number, since it is larger than the sum of its proper divisors (11723275).

128955893 is a wasteful number, since it uses less digits than its factorization.

128955893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11723274.

The product of its digits is 777600, while the sum is 50.

The square root of 128955893 is about 11355.8748231917. The cubic root of 128955893 is about 505.2198408906.

The spelling of 128955893 in words is "one hundred twenty-eight million, nine hundred fifty-five thousand, eight hundred ninety-three".