2138806587 has 4 divisors (see below), whose sum is σ = 2851742120. Its totient is φ = 1425871056.

The previous prime is 2138806543. The next prime is 2138806597. The reversal of 2138806587 is 7856088312.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2138806587 - 2⁸ = 2138806331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2138806517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 356467762 + ... + 356467767.

It is an arithmetic number, because the mean of its divisors is an integer number (712935530).

Almost surely, 2^2138806587 is an apocalyptic number.

2138806587 is a deficient number, since it is larger than the sum of its proper divisors (712935533).

2138806587 is an equidigital number, since it uses as much as digits as its factorization.

2138806587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712935532.

The product of its (nonzero) digits is 645120, while the sum is 48.

The square root of 2138806587 is about 46247.2332902196. The cubic root of 2138806587 is about 1288.4191493856.

The spelling of 2138806587 in words is "two billion, one hundred thirty-eight million, eight hundred six thousand, five hundred eighty-seven".