2001403540 has 24 divisors (see below), whose sum is σ = 4450180392. Its totient is φ = 753469440.

The previous prime is 2001403529. The next prime is 2001403553. The reversal of 2001403540 is 453041002.

It can be written as a sum of positive squares in 4 ways, for example, as 628404624 + 1372998916 = 25068^2 + 37054^2 .

It is a super-2 number, since 2×2001403540² = 8011232259849063200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2942901 + ... + 2943580.

It is an arithmetic number, because the mean of its divisors is an integer number (185424183).

Almost surely, 2^2001403540 is an apocalyptic number.

2001403540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001403540 is an abundant number, since it is smaller than the sum of its proper divisors (2448776852).

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

2001403540 is a wasteful number, since it uses less digits than its factorization.

2001403540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5886507 (or 5886505 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 2001403540 is about 44737.0488521538. The cubic root of 2001403540 is about 1260.2157059104.

Adding to 2001403540 its reverse (453041002), we get a palindrome (2454444542).

The spelling of 2001403540 in words is "two billion, one million, four hundred three thousand, five hundred forty".