9218138850 has 96 divisors (see below), whose sum is σ = 25626306240. Its totient is φ = 2436376320.

The previous prime is 9218138843. The next prime is 9218138873. The reversal of 9218138850 is 588318129.

It is a happy number.

9218138850 is a `hidden beast` number, since 9 + 218 + 1 + 388 + 50 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 9218138796 and 9218138805.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 122337 + ... + 182763.

It is an arithmetic number, because the mean of its divisors is an integer number (266940690).

Almost surely, 2^9218138850 is an apocalyptic number.

9218138850 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 9218138850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12813153120).

9218138850 is an abundant number, since it is smaller than the sum of its proper divisors (16408167390).

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

9218138850 is a wasteful number, since it uses less digits than its factorization.

9218138850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60561 (or 60550 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The square root of 9218138850 is about 96011.1391974910. The cubic root of 9218138850 is about 2096.7552953195.

The spelling of 9218138850 in words is "nine billion, two hundred eighteen million, one hundred thirty-eight thousand, eight hundred fifty".