2138934036 has 96 divisors (see below), whose sum is σ = 5474101248. Its totient is φ = 647982720.

The previous prime is 2138934019. The next prime is 2138934037. The reversal of 2138934036 is 6304398312.

It is a junction number, because it is equal to n+sod(n) for n = 2138933985 and 2138934003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138934037) 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 31 ways as a sum of consecutive naturals, for example, 436681 + ... + 441551.

It is an arithmetic number, because the mean of its divisors is an integer number (57021888).

Almost surely, 2^2138934036 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2138934036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2737050624).

2138934036 is an abundant number, since it is smaller than the sum of its proper divisors (3335167212).

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

2138934036 is a wasteful number, since it uses less digits than its factorization.

2138934036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4981 (or 4979 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 39.

The square root of 2138934036 is about 46248.6111791479. The cubic root of 2138934036 is about 1288.4447406774. Note that the first 3 decimals are identical.

The spelling of 2138934036 in words is "two billion, one hundred thirty-eight million, nine hundred thirty-four thousand, thirty-six".