999998220 has 96 divisors (see below), whose sum is σ = 3046696128. Its totient is φ = 243597312.

The previous prime is 999998203. The next prime is 999998243. The reversal of 999998220 is 22899999.

999998220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 69052 + ... + 82268.

It is an arithmetic number, because the mean of its divisors is an integer number (31736418).

Almost surely, 2^999998220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999998220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1523348064).

999998220 is an abundant number, since it is smaller than the sum of its proper divisors (2046697908).

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

999998220 is a wasteful number, since it uses less digits than its factorization.

999998220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13339 (or 13337 counting only the distinct ones).

The product of its (nonzero) digits is 1889568, while the sum is 57.

The square root of 999998220 is about 31622.7484574001. The cubic root of 999998220 is about 999.9994066663. Note that the first 3 decimals are identical.

The spelling of 999998220 in words is "nine hundred ninety-nine million, nine hundred ninety-eight thousand, two hundred twenty".