1001222208 has 336 divisors, whose sum is σ = 3608002944. Its totient is φ = 268738560.

The previous prime is 1001222207. The next prime is 1001222227. The reversal of 1001222208 is 8022221001.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (336).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1001222207) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1850418 + ... + 1850958.

It is an arithmetic number, because the mean of its divisors is an integer number (10738104).

Almost surely, 2^1001222208 is an apocalyptic number.

1001222208 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1001222208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1804001472).

1001222208 is an abundant number, since it is smaller than the sum of its proper divisors (2606780736).

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

1001222208 is an equidigital number, since it uses as much as digits as its factorization.

1001222208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592 (or 570 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1001222208 is about 31642.0955058289. The cubic root of 1001222208 is about 1000.4072368023.

Adding to 1001222208 its reverse (8022221001), we get a palindrome (9023443209).

The spelling of 1001222208 in words is "one billion, one million, two hundred twenty-two thousand, two hundred eight".