2158644 has 24 divisors (see below), whose sum is σ = 5211360. Its totient is φ = 694624.

The previous prime is 2158631. The next prime is 2158649. The reversal of 2158644 is 4468512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2158649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2754 + ... + 3449.

It is an arithmetic number, because the mean of its divisors is an integer number (217140).

2^2158644 is an apocalyptic number.

It is an amenable number.

2158644 is an abundant number, since it is smaller than the sum of its proper divisors (3052716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2158644 is a wasteful number, since it uses less digits than its factorization.

2158644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6239 (or 6237 counting only the distinct ones).

The product of its digits is 7680, while the sum is 30.

The square root of 2158644 is about 1469.2324526772. The cubic root of 2158644 is about 129.2390256150.

The spelling of 2158644 in words is "two million, one hundred fifty-eight thousand, six hundred forty-four".