2157644 has 12 divisors (see below), whose sum is σ = 3813264. Its totient is φ = 1068144.

The previous prime is 2157641. The next prime is 2157667. The reversal of 2157644 is 4467512.

It is not an unprimeable number, because it can be changed into a prime (2157641) 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, 2207 + ... + 3030.

It is an arithmetic number, because the mean of its divisors is an integer number (317772).

2^2157644 is an apocalyptic number.

It is an amenable number.

2157644 is a deficient number, since it is larger than the sum of its proper divisors (1655620).

2157644 is a wasteful number, since it uses less digits than its factorization.

2157644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5344 (or 5342 counting only the distinct ones).

The product of its digits is 6720, while the sum is 29.

The square root of 2157644 is about 1468.8920995090. The cubic root of 2157644 is about 129.2190657100.

The spelling of 2157644 in words is "two million, one hundred fifty-seven thousand, six hundred forty-four".