2144220 has 48 divisors (see below), whose sum is σ = 6468000. Its totient is φ = 527616.

The previous prime is 2144213. The next prime is 2144243. The reversal of 2144220 is 224412.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 2144220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 595 + ... + 2154.

It is an arithmetic number, because the mean of its divisors is an integer number (134750).

2^2144220 is an apocalyptic number.

2144220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2144220 is an abundant number, since it is smaller than the sum of its proper divisors (4323780).

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

2144220 is a wasteful number, since it uses less digits than its factorization.

2144220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2774 (or 2772 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 2144220 is about 1464.3155397659. The cubic root of 2144220 is about 128.9505248648.

Adding to 2144220 its reverse (224412), we get a palindrome (2368632).

The spelling of 2144220 in words is "two million, one hundred forty-four thousand, two hundred twenty".