8000138844 has 18 divisors (see below), whose sum is σ = 20222573280. Its totient is φ = 2666712936.

The previous prime is 8000138771. The next prime is 8000138849. The reversal of 8000138844 is 4488310008.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 222226079 = 8000138844 / (8 + 0 + 0 + 0 + 1 + 3 + 8 + 8 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 8000138799 and 8000138808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8000138849) by changing a digit.

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 in 5 ways as a sum of consecutive naturals, for example, 111113004 + ... + 111113075.

Almost surely, 2^8000138844 is an apocalyptic number.

It is an amenable number.

8000138844 is an abundant number, since it is smaller than the sum of its proper divisors (12222434436).

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

8000138844 is a wasteful number, since it uses less digits than its factorization.

8000138844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222226089 (or 222226084 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 36.

The square root of 8000138844 is about 89443.4952581796. The cubic root of 8000138844 is about 2000.0115702664.

The spelling of 8000138844 in words is "eight billion, one hundred thirty-eight thousand, eight hundred forty-four".