999990220 has 24 divisors (see below), whose sum is σ = 2139603984. Its totient is φ = 392448576.

The previous prime is 999990143. The next prime is 999990227. The reversal of 999990220 is 22099999.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (999990227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 470634 + ... + 472753.

It is an arithmetic number, because the mean of its divisors is an integer number (89150166).

Almost surely, 2^999990220 is an apocalyptic number.

It is an amenable number.

999990220 is an abundant number, since it is smaller than the sum of its proper divisors (1139613764).

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

999990220 is a wasteful number, since it uses less digits than its factorization.

999990220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 943449 (or 943447 counting only the distinct ones).

The product of its (nonzero) digits is 236196, while the sum is 49.

The square root of 999990220 is about 31622.6219659281. The cubic root of 999990220 is about 999.9967399894.

The spelling of 999990220 in words is "nine hundred ninety-nine million, nine hundred ninety thousand, two hundred twenty".