2143257 has 12 divisors (see below), whose sum is σ = 3017520. Its totient is φ = 1352952.

The previous prime is 2143243. The next prime is 2143259. The reversal of 2143257 is 7523412.

It is a de Polignac number, because none of the positive numbers 2^k-2143257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2143259) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 94 + ... + 2072.

It is an arithmetic number, because the mean of its divisors is an integer number (251460).

2^2143257 is an apocalyptic number.

It is an amenable number.

2143257 is a deficient number, since it is larger than the sum of its proper divisors (874263).

2143257 is a wasteful number, since it uses less digits than its factorization.

2143257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2020 (or 2001 counting only the distinct ones).

The product of its digits is 1680, while the sum is 24.

The square root of 2143257 is about 1463.9866802673. The cubic root of 2143257 is about 128.9312174632.

Adding to 2143257 its reverse (7523412), we get a palindrome (9666669).

The spelling of 2143257 in words is "two million, one hundred forty-three thousand, two hundred fifty-seven".