2138678919 has 36 divisors (see below), whose sum is σ = 3361396584. Its totient is φ = 1302575904.

The previous prime is 2138678887. The next prime is 2138678947. The reversal of 2138678919 is 9198768312.

It is not a de Polignac number, because 2138678919 - 2⁵ = 2138678887 is a prime.

It is a super-2 number, since 2×2138678919² = 9147895037150017122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138678119) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1240392 + ... + 1242114.

Almost surely, 2^2138678919 is an apocalyptic number.

2138678919 is a deficient number, since it is larger than the sum of its proper divisors (1222717665).

2138678919 is a wasteful number, since it uses less digits than its factorization.

2138678919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1948 (or 1842 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 2138678919 is about 46245.8529924576. The cubic root of 2138678919 is about 1288.3935131001.

The spelling of 2138678919 in words is "two billion, one hundred thirty-eight million, six hundred seventy-eight thousand, nine hundred nineteen".