2128857 has 8 divisors (see below), whose sum is σ = 2961984. Its totient is φ = 1357488.

The previous prime is 2128849. The next prime is 2128871. The reversal of 2128857 is 7588212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2128857 - 2³ = 2128849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2128837) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15358 + ... + 15495.

It is an arithmetic number, because the mean of its divisors is an integer number (370248).

2^2128857 is an apocalyptic number.

It is an amenable number.

2128857 is a deficient number, since it is larger than the sum of its proper divisors (833127).

2128857 is a wasteful number, since it uses less digits than its factorization.

2128857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30879.

The product of its digits is 8960, while the sum is 33.

The square root of 2128857 is about 1459.0603140378. The cubic root of 2128857 is about 128.6418163086.

The spelling of 2128857 in words is "two million, one hundred twenty-eight thousand, eight hundred fifty-seven".