2138655188 has 6 divisors (see below), whose sum is σ = 3742646586. Its totient is φ = 1069327592.

The previous prime is 2138655173. The next prime is 2138655193. The reversal of 2138655188 is 8815568312.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1449172624 + 689482564 = 38068^2 + 26258^2 .

It is a congruent number.

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 as a sum of consecutive naturals, namely, 267331895 + ... + 267331902.

It is an arithmetic number, because the mean of its divisors is an integer number (623774431).

Almost surely, 2^2138655188 is an apocalyptic number.

It is an amenable number.

2138655188 is a deficient number, since it is larger than the sum of its proper divisors (1603991398).

2138655188 is a wasteful number, since it uses less digits than its factorization.

2138655188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534663801 (or 534663799 counting only the distinct ones).

The product of its digits is 460800, while the sum is 47.

The square root of 2138655188 is about 46245.5964173888. The cubic root of 2138655188 is about 1288.3887477004.

The spelling of 2138655188 in words is "two billion, one hundred thirty-eight million, six hundred fifty-five thousand, one hundred eighty-eight".