2001223290 has 128 divisors (see below), whose sum is σ = 5512126464. Its totient is φ = 460512000.

The previous prime is 2001223283. The next prime is 2001223297. The reversal of 2001223290 is 923221002.

It is an interprime number because it is at equal distance from previous prime (2001223283) and next prime (2001223297).

It is not an unprimeable number, because it can be changed into a prime (2001223297) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 540345 + ... + 544035.

It is an arithmetic number, because the mean of its divisors is an integer number (43063488).

Almost surely, 2^2001223290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2001223290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2756063232).

2001223290 is an abundant number, since it is smaller than the sum of its proper divisors (3510903174).

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

2001223290 is a wasteful number, since it uses less digits than its factorization.

2001223290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3796.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 2001223290 is about 44735.0342572798. The cubic root of 2001223290 is about 1260.1778723441.

Adding to 2001223290 its reverse (923221002), we get a palindrome (2924444292).

The spelling of 2001223290 in words is "two billion, one million, two hundred twenty-three thousand, two hundred ninety".