9884776381 has 4 divisors (see below), whose sum is σ = 9884989564. Its totient is φ = 9884563200.

The previous prime is 9884776379. The next prime is 9884776427. The reversal of 9884776381 is 1836774889.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1836774889 = 397 ⋅4626637.

It can be written as a sum of positive squares in 2 ways, for example, as 4670492281 + 5214284100 = 68341^2 + 72210^2 .

It is a cyclic number.

It is not a de Polignac number, because 9884776381 - 2¹ = 9884776379 is a prime.

It is a super-2 number, since 2×9884776381² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9884776331) 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, 4350 + ... + 140671.

It is an arithmetic number, because the mean of its divisors is an integer number (2471247391).

Almost surely, 2^9884776381 is an apocalyptic number.

It is an amenable number.

9884776381 is a deficient number, since it is larger than the sum of its proper divisors (213183).

9884776381 is a wasteful number, since it uses less digits than its factorization.

9884776381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213182.

The product of its digits is 16257024, while the sum is 61.

The square root of 9884776381 is about 99422.2127142622. The cubic root of 9884776381 is about 2146.1279781564.

The spelling of 9884776381 in words is "nine billion, eight hundred eighty-four million, seven hundred seventy-six thousand, three hundred eighty-one".