2157443 has 4 divisors (see below), whose sum is σ = 2161008. Its totient is φ = 2153880.

The previous prime is 2157427. The next prime is 2157451. The reversal of 2157443 is 3447512.

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

It is a cyclic number.

It is not a de Polignac number, because 2157443 - 2⁴ = 2157427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2157413) 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, 623 + ... + 2168.

It is an arithmetic number, because the mean of its divisors is an integer number (540252).

2^2157443 is an apocalyptic number.

2157443 is a deficient number, since it is larger than the sum of its proper divisors (3565).

2157443 is an equidigital number, since it uses as much as digits as its factorization.

2157443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3564.

The product of its digits is 3360, while the sum is 26.

The square root of 2157443 is about 1468.8236790030. The cubic root of 2157443 is about 129.2150530247.

The spelling of 2157443 in words is "two million, one hundred fifty-seven thousand, four hundred forty-three".