9990231822 has 16 divisors (see below), whose sum is σ = 22200515280. Its totient is φ = 3330077256.

The previous prime is 9990231821. The next prime is 9990231841. The reversal of 9990231822 is 2281320999.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9990231821) 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 7 ways as a sum of consecutive naturals, for example, 92502093 + ... + 92502200.

It is an arithmetic number, because the mean of its divisors is an integer number (1387532205).

Almost surely, 2^9990231822 is an apocalyptic number.

9990231822 is an abundant number, since it is smaller than the sum of its proper divisors (12210283458).

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

9990231822 is a wasteful number, since it uses less digits than its factorization.

9990231822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185004304 (or 185004298 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 9990231822 is about 99951.1471770084. The cubic root of 9990231822 is about 2153.7329647783.

The spelling of 9990231822 in words is "nine billion, nine hundred ninety million, two hundred thirty-one thousand, eight hundred twenty-two".