2105143440 has 40 divisors (see below), whose sum is σ = 6525945408. Its totient is φ = 561371520.

The previous prime is 2105143421. The next prime is 2105143493. The reversal of 2105143440 is 443415012.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 2105143440.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4385476 + ... + 4385955.

Almost surely, 2^2105143440 is an apocalyptic number.

2105143440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2105143440 is an abundant number, since it is smaller than the sum of its proper divisors (4420801968).

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

2105143440 is a wasteful number, since it uses less digits than its factorization.

2105143440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8771447 (or 8771441 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 2105143440 is about 45881.8421600528. The cubic root of 2105143440 is about 1281.6238018120.

Adding to 2105143440 its reverse (443415012), we get a palindrome (2548558452).

The spelling of 2105143440 in words is "two billion, one hundred five million, one hundred forty-three thousand, four hundred forty".