2128899 has 8 divisors (see below), whose sum is σ = 2877712. Its totient is φ = 1399680.

The previous prime is 2128891. The next prime is 2128933. The reversal of 2128899 is 9988212.

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

It is not a de Polignac number, because 2128899 - 2³ = 2128891 is a prime.

It is a Duffinian number.

2128899 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2128891) 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, 4642 + ... + 5079.

It is an arithmetic number, because the mean of its divisors is an integer number (359714).

2^2128899 is an apocalyptic number.

2128899 is a deficient number, since it is larger than the sum of its proper divisors (748813).

2128899 is an equidigital number, since it uses as much as digits as its factorization.

2128899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9797.

The product of its digits is 20736, while the sum is 39.

The square root of 2128899 is about 1459.0747067919. The cubic root of 2128899 is about 128.6426622900.

It can be divided in two parts, 21 and 28899, that added together give a triangular number (28920 = T₂₄₀).

The spelling of 2128899 in words is "two million, one hundred twenty-eight thousand, eight hundred ninety-nine".