2128665 has 64 divisors (see below), whose sum is σ = 4515840. Its totient is φ = 829440.

The previous prime is 2128663. The next prime is 2128667. The reversal of 2128665 is 5668212.

It is an interprime number because it is at equal distance from previous prime (2128663) and next prime (2128667).

It is not a de Polignac number, because 2128665 - 2¹ = 2128663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2128663) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 21897 + ... + 21993.

It is an arithmetic number, because the mean of its divisors is an integer number (70560).

2^2128665 is an apocalyptic number.

It is an amenable number.

2128665 is an abundant number, since it is smaller than the sum of its proper divisors (2387175).

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

2128665 is a wasteful number, since it uses less digits than its factorization.

2128665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142.

The product of its digits is 5760, while the sum is 30.

The square root of 2128665 is about 1458.9945167820. The cubic root of 2128665 is about 128.6379488230.

The spelling of 2128665 in words is "two million, one hundred twenty-eight thousand, six hundred sixty-five".