2001223040 has 64 divisors (see below), whose sum is σ = 4851666720. Its totient is φ = 789196800.

The previous prime is 2001222991. The next prime is 2001223057. The reversal of 2001223040 is 403221002.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23420 + ... + 67460.

Almost surely, 2^2001223040 is an apocalyptic number.

2001223040 is a gapful number since it is divisible by the number (20) 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 2001223040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2425833360).

2001223040 is an abundant number, since it is smaller than the sum of its proper divisors (2850443680).

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

2001223040 is an equidigital number, since it uses as much as digits as its factorization.

2001223040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44131 (or 44119 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 2001223040 is about 44735.0314630492. The cubic root of 2001223040 is about 1260.1778198688.

Adding to 2001223040 its reverse (403221002), we get a palindrome (2404444042).

The spelling of 2001223040 in words is "two billion, one million, two hundred twenty-three thousand, forty".