2155128 has 16 divisors (see below), whose sum is σ = 5387880. Its totient is φ = 718368.

The previous prime is 2155121. The next prime is 2155129. The reversal of 2155128 is 8215512.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 89797 = 2155128 / (2 + 1 + 5 + 5 + 1 + 2 + 8).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 2155098 and 2155107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155121) 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, 44875 + ... + 44922.

2^2155128 is an apocalyptic number.

It is an amenable number.

2155128 is an abundant number, since it is smaller than the sum of its proper divisors (3232752).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2155128 is a wasteful number, since it uses less digits than its factorization.

2155128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89806 (or 89802 counting only the distinct ones).

The product of its digits is 800, while the sum is 24.

The square root of 2155128 is about 1468.0354219160. The cubic root of 2155128 is about 129.1688192958.

The spelling of 2155128 in words is "two million, one hundred fifty-five thousand, one hundred twenty-eight".