2138919938 has 8 divisors (see below), whose sum is σ = 3210442560. Its totient is φ = 1068772420.

The previous prime is 2138919931. The next prime is 2138919949. The reversal of 2138919938 is 8399198312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 2138919938.

It is not an unprimeable number, because it can be changed into a prime (2138919931) 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 3 ways as a sum of consecutive naturals, for example, 339878 + ... + 346113.

It is an arithmetic number, because the mean of its divisors is an integer number (401305320).

Almost surely, 2^2138919938 is an apocalyptic number.

2138919938 is a deficient number, since it is larger than the sum of its proper divisors (1071522622).

2138919938 is a wasteful number, since it uses less digits than its factorization.

2138919938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687552.

The product of its digits is 839808, while the sum is 53.

The square root of 2138919938 is about 46248.4587635091. The cubic root of 2138919938 is about 1288.4419099007.

The spelling of 2138919938 in words is "two billion, one hundred thirty-eight million, nine hundred nineteen thousand, nine hundred thirty-eight".