2144840 has 48 divisors (see below), whose sum is σ = 5111100. Its totient is φ = 809088.

The previous prime is 2144837. The next prime is 2144843. The reversal of 2144840 is 484412.

It is an interprime number because it is at equal distance from previous prime (2144837) and next prime (2144843).

It can be written as a sum of positive squares in 2 ways, for example, as 2137444 + 7396 = 1462^2 + 86^2 .

It is not an unprimeable number, because it can be changed into a prime (2144843) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49859 + ... + 49901.

2^2144840 is an apocalyptic number.

2144840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2144840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2555550).

2144840 is an abundant number, since it is smaller than the sum of its proper divisors (2966260).

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

2144840 is a wasteful number, since it uses less digits than its factorization.

2144840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126 (or 79 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 2144840 is about 1464.5272274697. The cubic root of 2144840 is about 128.9629523242.

The spelling of 2144840 in words is "two million, one hundred forty-four thousand, eight hundred forty".