2001243240 has 128 divisors (see below), whose sum is σ = 6709996800. Its totient is φ = 530530560.

The previous prime is 2001243239. The next prime is 2001243289. The reversal of 2001243240 is 423421002.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 181485 + ... + 192195.

It is an arithmetic number, because the mean of its divisors is an integer number (52421850).

Almost surely, 2^2001243240 is an apocalyptic number.

2001243240 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 2001243240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3354998400).

2001243240 is an abundant number, since it is smaller than the sum of its proper divisors (4708753560).

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

2001243240 is a wasteful number, since it uses less digits than its factorization.

2001243240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10904 (or 10894 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 2001243240 is about 44735.2572363231. The cubic root of 2001243240 is about 1260.1820598603.

Adding to 2001243240 its reverse (423421002), we get a palindrome (2424664242).

The spelling of 2001243240 in words is "two billion, one million, two hundred forty-three thousand, two hundred forty".