2138678387 has 8 divisors (see below), whose sum is σ = 2270904336. Its totient is φ = 2007165952.

The previous prime is 2138678371. The next prime is 2138678413. The reversal of 2138678387 is 7838768312.

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

It is a cyclic number.

It is not a de Polignac number, because 2138678387 - 2⁴ = 2138678371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2138678317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172193 + ... + 184194.

It is an arithmetic number, because the mean of its divisors is an integer number (283863042).

Almost surely, 2^2138678387 is an apocalyptic number.

2138678387 is a deficient number, since it is larger than the sum of its proper divisors (132225949).

2138678387 is a wasteful number, since it uses less digits than its factorization.

2138678387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356757.

The product of its digits is 2709504, while the sum is 53.

The square root of 2138678387 is about 46245.8472405902. The cubic root of 2138678387 is about 1288.3934062700.

The spelling of 2138678387 in words is "two billion, one hundred thirty-eight million, six hundred seventy-eight thousand, three hundred eighty-seven".