2001223240 has 16 divisors (see below), whose sum is σ = 4502752380. Its totient is φ = 800489280.

The previous prime is 2001223229. The next prime is 2001223267. The reversal of 2001223240 is 423221002.

It can be written as a sum of positive squares in 2 ways, for example, as 1676574916 + 324648324 = 40946^2 + 18018^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25015251 + ... + 25015330.

Almost surely, 2^2001223240 is an apocalyptic number.

2001223240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001223240 is an abundant number, since it is smaller than the sum of its proper divisors (2501529140).

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

2001223240 is a wasteful number, since it uses less digits than its factorization.

2001223240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50030592 (or 50030588 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 2001223240 is about 44735.0336984337. The cubic root of 2001223240 is about 1260.1778618491.

Adding to 2001223240 its reverse (423221002), we get a palindrome (2424444242).

The spelling of 2001223240 in words is "two billion, one million, two hundred twenty-three thousand, two hundred forty".