2138440500 has 480 divisors, whose sum is σ = 8414165760. Its totient is φ = 461894400.

The previous prime is 2138440471. The next prime is 2138440501. The reversal of 2138440500 is 50448312.

2138440500 is a `hidden beast` number, since 213 + 8 + 440 + 5 + 0 + 0 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138440501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 5386302 + ... + 5386698.

It is an arithmetic number, because the mean of its divisors is an integer number (17529512).

Almost surely, 2^2138440500 is an apocalyptic number.

2138440500 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 2138440500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4207082880).

2138440500 is an abundant number, since it is smaller than the sum of its proper divisors (6275725260).

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

2138440500 is a wasteful number, since it uses less digits than its factorization.

2138440500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454 (or 433 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 2138440500 is about 46243.2751867772. The cubic root of 2138440500 is about 1288.3456348038.

Adding to 2138440500 its reverse (50448312), we get a palindrome (2188888812).

The spelling of 2138440500 in words is "two billion, one hundred thirty-eight million, four hundred forty thousand, five hundred".