2144243340 has 120 divisors (see below), whose sum is σ = 6943719552. Its totient is φ = 553340160.

The previous prime is 2144243291. The next prime is 2144243341. The reversal of 2144243340 is 433424412.

It is a happy number.

It is a super-2 number, since 2×2144243340² = 9195559002268711200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (2144243341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 28872 + ... + 71568.

Almost surely, 2^2144243340 is an apocalyptic number.

2144243340 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 2144243340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3471859776).

2144243340 is an abundant number, since it is smaller than the sum of its proper divisors (4799476212).

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

2144243340 is a wasteful number, since it uses less digits than its factorization.

2144243340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42749 (or 42738 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

The square root of 2144243340 is about 46305.9752083897. The cubic root of 2144243340 is about 1289.5099274193.

Adding to 2144243340 its reverse (433424412), we get a palindrome (2577667752).

The spelling of 2144243340 in words is "two billion, one hundred forty-four million, two hundred forty-three thousand, three hundred forty".