2128237 has 4 divisors (see below), whose sum is σ = 2134620. Its totient is φ = 2121856.

The previous prime is 2128201. The next prime is 2128241. The reversal of 2128237 is 7328212.

2128237 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1510441 + 617796 = 1229^2 + 786^2 .

It is a cyclic number.

It is not a de Polignac number, because 2128237 - 2¹⁹ = 1603949 is a prime.

It is a Duffinian number.

2128237 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2128267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2662 + ... + 3367.

It is an arithmetic number, because the mean of its divisors is an integer number (533655).

2^2128237 is an apocalyptic number.

It is an amenable number.

2128237 is a deficient number, since it is larger than the sum of its proper divisors (6383).

2128237 is an equidigital number, since it uses as much as digits as its factorization.

2128237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6382.

The product of its digits is 1344, while the sum is 25.

The square root of 2128237 is about 1458.8478330518. The cubic root of 2128237 is about 128.6293267159.

Subtracting from 2128237 its sum of digits (25), we obtain a palindrome (2128212).

The spelling of 2128237 in words is "two million, one hundred twenty-eight thousand, two hundred thirty-seven".