2138285979 has 8 divisors (see below), whose sum is σ = 3167831120. Its totient is φ = 1425523968.

The previous prime is 2138285927. The next prime is 2138285987. The reversal of 2138285979 is 9795828312.

2138285979 is a `hidden beast` number, since 21 + 3 + 8 + 28 + 597 + 9 = 666.

It is not a de Polignac number, because 2138285979 - 2¹² = 2138281883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2138280979) 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, 39597862 + ... + 39597915.

It is an arithmetic number, because the mean of its divisors is an integer number (395978890).

Almost surely, 2^2138285979 is an apocalyptic number.

2138285979 is a deficient number, since it is larger than the sum of its proper divisors (1029545141).

2138285979 is an equidigital number, since it uses as much as digits as its factorization.

2138285979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79195786 (or 79195780 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The square root of 2138285979 is about 46241.6044163695. The cubic root of 2138285979 is about 1288.3146026489.

The spelling of 2138285979 in words is "two billion, one hundred thirty-eight million, two hundred eighty-five thousand, nine hundred seventy-nine".