2138881986 has 24 divisors (see below), whose sum is σ = 4652286444. Its totient is φ = 710184960.

The previous prime is 2138881883. The next prime is 2138881991. The reversal of 2138881986 is 6891888312.

It can be written as a sum of positive squares in 2 ways, for example, as 2138600025 + 281961 = 46245^2 + 531^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 226555 + ... + 235806.

Almost surely, 2^2138881986 is an apocalyptic number.

2138881986 is an abundant number, since it is smaller than the sum of its proper divisors (2513404458).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2138881986 is a wasteful number, since it uses less digits than its factorization.

2138881986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462626 (or 462623 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 54.

The square root of 2138881986 is about 46248.0484561241. The cubic root of 2138881986 is about 1288.4342893511.

The spelling of 2138881986 in words is "two billion, one hundred thirty-eight million, eight hundred eighty-one thousand, nine hundred eighty-six".