2144138240 has 88 divisors (see below), whose sum is σ = 5263573920. Its totient is φ = 837623808.

The previous prime is 2144138207. The next prime is 2144138257. The reversal of 2144138240 is 428314412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215291 + ... + 225029.

It is an arithmetic number, because the mean of its divisors is an integer number (59813340).

Almost surely, 2^2144138240 is an apocalyptic number.

2144138240 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 2144138240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2631786960).

2144138240 is an abundant number, since it is smaller than the sum of its proper divisors (3119435680).

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

2144138240 is an equidigital number, since it uses as much as digits as its factorization.

2144138240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9807 (or 9789 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 29.

The square root of 2144138240 is about 46304.8403517386. The cubic root of 2144138240 is about 1289.4888586495.

The spelling of 2144138240 in words is "two billion, one hundred forty-four million, one hundred thirty-eight thousand, two hundred forty".