2138531828 has 6 divisors (see below), whose sum is σ = 3742430706. Its totient is φ = 1069265912.

The previous prime is 2138531761. The next prime is 2138531831. The reversal of 2138531828 is 8281358312.

It can be written as a sum of positive squares in only one way, i.e., 2134255204 + 4276624 = 46198^2 + 2068^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 267316475 + ... + 267316482.

It is an arithmetic number, because the mean of its divisors is an integer number (623738451).

Almost surely, 2^2138531828 is an apocalyptic number.

It is an amenable number.

2138531828 is a deficient number, since it is larger than the sum of its proper divisors (1603898878).

2138531828 is a wasteful number, since it uses less digits than its factorization.

2138531828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534632961 (or 534632959 counting only the distinct ones).

The product of its digits is 92160, while the sum is 41.

The square root of 2138531828 is about 46244.2626495439. The cubic root of 2138531828 is about 1288.3639753274.

The spelling of 2138531828 in words is "two billion, one hundred thirty-eight million, five hundred thirty-one thousand, eight hundred twenty-eight".