2138655187 has 16 divisors (see below), whose sum is σ = 2251100160. Its totient is φ = 2029118400.

The previous prime is 2138655173. The next prime is 2138655193. The reversal of 2138655187 is 7815568312.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2138655187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2138655157) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 786943 + ... + 789655.

It is an arithmetic number, because the mean of its divisors is an integer number (140693760).

Almost surely, 2^2138655187 is an apocalyptic number.

2138655187 is a deficient number, since it is larger than the sum of its proper divisors (112444973).

2138655187 is a wasteful number, since it uses less digits than its factorization.

2138655187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3234.

The product of its digits is 403200, while the sum is 46.

The square root of 2138655187 is about 46245.5964065769. The cubic root of 2138655187 is about 1288.3887474996.

The spelling of 2138655187 in words is "two billion, one hundred thirty-eight million, six hundred fifty-five thousand, one hundred eighty-seven".