2157844 has 24 divisors (see below), whose sum is σ = 4307688. Its totient is φ = 936960.

The previous prime is 2157839. The next prime is 2157851. The reversal of 2157844 is 4487512.

It can be written as a sum of positive squares in 4 ways, for example, as 26244 + 2131600 = 162^2 + 1460^2 .

It is a zygodrome in base 3.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 337 + ... + 2104.

It is an arithmetic number, because the mean of its divisors is an integer number (179487).

2^2157844 is an apocalyptic number.

It is an amenable number.

2157844 is a deficient number, since it is larger than the sum of its proper divisors (2149844).

2157844 is a wasteful number, since it uses less digits than its factorization.

2157844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2475 (or 2473 counting only the distinct ones).

The product of its digits is 8960, while the sum is 31.

The square root of 2157844 is about 1468.9601764514. The cubic root of 2157844 is about 129.2230581843.

The spelling of 2157844 in words is "two million, one hundred fifty-seven thousand, eight hundred forty-four".