2128757 has 4 divisors (see below), whose sum is σ = 2253996. Its totient is φ = 2003520.

The previous prime is 2128751. The next prime is 2128769. The reversal of 2128757 is 7578212.

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 1503076 + 625681 = 1226^2 + 791^2 .

It is a cyclic number.

It is not a de Polignac number, because 2128757 - 2⁸ = 2128501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2128751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62594 + ... + 62627.

It is an arithmetic number, because the mean of its divisors is an integer number (563499).

2^2128757 is an apocalyptic number.

It is an amenable number.

2128757 is a deficient number, since it is larger than the sum of its proper divisors (125239).

2128757 is a wasteful number, since it uses less digits than its factorization.

2128757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125238.

The product of its digits is 7840, while the sum is 32.

The square root of 2128757 is about 1459.0260450040. The cubic root of 2128757 is about 128.6398020222.

The spelling of 2128757 in words is "two million, one hundred twenty-eight thousand, seven hundred fifty-seven".