9885438821 has 4 divisors (see below), whose sum is σ = 10032982752. Its totient is φ = 9737894892.

The previous prime is 9885438803. The next prime is 9885438833. The reversal of 9885438821 is 1288345889.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9885438821 - 2²² = 9881244517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9885408821) 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 3 ways as a sum of consecutive naturals, for example, 73771865 + ... + 73771998.

It is an arithmetic number, because the mean of its divisors is an integer number (2508245688).

Almost surely, 2^9885438821 is an apocalyptic number.

It is an amenable number.

9885438821 is a deficient number, since it is larger than the sum of its proper divisors (147543931).

9885438821 is a wasteful number, since it uses less digits than its factorization.

9885438821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147543930.

The product of its digits is 4423680, while the sum is 56.

The square root of 9885438821 is about 99425.5441071358. The cubic root of 9885438821 is about 2146.1759188551.

The spelling of 9885438821 in words is "nine billion, eight hundred eighty-five million, four hundred thirty-eight thousand, eight hundred twenty-one".