2138738040 has 256 divisors, whose sum is σ = 7947072000. Its totient is φ = 508446720.

The previous prime is 2138738033. The next prime is 2138738051. The reversal of 2138738040 is 408378312.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 2138737986 and 2138738004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 345775 + ... + 351905.

It is an arithmetic number, because the mean of its divisors is an integer number (31043250).

Almost surely, 2^2138738040 is an apocalyptic number.

2138738040 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 2138738040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3973536000).

2138738040 is an abundant number, since it is smaller than the sum of its proper divisors (5808333960).

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

2138738040 is a wasteful number, since it uses less digits than its factorization.

2138738040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6187 (or 6177 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 2138738040 is about 46246.4921913003. The cubic root of 2138738040 is about 1288.4053849789.

The spelling of 2138738040 in words is "two billion, one hundred thirty-eight million, seven hundred thirty-eight thousand, forty".