2001440243 has 32 divisors (see below), whose sum is σ = 2435443200. Its totient is φ = 1622325760.

The previous prime is 2001440237. The next prime is 2001440263. The reversal of 2001440243 is 3420441002.

It is not a de Polignac number, because 2001440243 - 2²⁴ = 1984663027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001440263) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 458033 + ... + 462381.

It is an arithmetic number, because the mean of its divisors is an integer number (76107600).

Almost surely, 2^2001440243 is an apocalyptic number.

2001440243 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2001440243 is a deficient number, since it is larger than the sum of its proper divisors (434002957).

2001440243 is a wasteful number, since it uses less digits than its factorization.

2001440243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4507.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 2001440243 is about 44737.4590583775. The cubic root of 2001440243 is about 1260.2234094067.

Adding to 2001440243 its reverse (3420441002), we get a palindrome (5421881245).

It can be divided in two parts, 2001 and 440243, that added together give a palindrome (442244).

The spelling of 2001440243 in words is "two billion, one million, four hundred forty thousand, two hundred forty-three".