2128399 has 16 divisors (see below), whose sum is σ = 2759680. Its totient is φ = 1594080.

The previous prime is 2128391. The next prime is 2128403. The reversal of 2128399 is 9938212.

It is a cyclic number.

It is not a de Polignac number, because 2128399 - 2³ = 2128391 is a prime.

2128399 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2128391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1114 + ... + 2344.

It is an arithmetic number, because the mean of its divisors is an integer number (172480).

2^2128399 is an apocalyptic number.

2128399 is a deficient number, since it is larger than the sum of its proper divisors (631281).

2128399 is a wasteful number, since it uses less digits than its factorization.

2128399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1270.

The product of its digits is 7776, while the sum is 34.

The square root of 2128399 is about 1458.9033552638. The cubic root of 2128399 is about 128.6325903597.

The spelling of 2128399 in words is "two million, one hundred twenty-eight thousand, three hundred ninety-nine".