2138678386 has 8 divisors (see below), whose sum is σ = 3454788204. Its totient is φ = 987082320.

The previous prime is 2138678371. The next prime is 2138678413. The reversal of 2138678386 is 6838768312.

It can be written as a sum of positive squares in 2 ways, for example, as 1795132161 + 343546225 = 42369^2 + 18535^2 .

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 41128405 + ... + 41128456.

Almost surely, 2^2138678386 is an apocalyptic number.

2138678386 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2138678386 is a deficient number, since it is larger than the sum of its proper divisors (1316109818).

2138678386 is a wasteful number, since it uses less digits than its factorization.

2138678386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82256876.

The product of its digits is 2322432, while the sum is 52.

The square root of 2138678386 is about 46245.8472297784. The cubic root of 2138678386 is about 1288.3934060692.

The spelling of 2138678386 in words is "two billion, one hundred thirty-eight million, six hundred seventy-eight thousand, three hundred eighty-six".