2105143405 has 8 divisors (see below), whose sum is σ = 2674770552. Its totient is φ = 1585049088.

The previous prime is 2105143393. The next prime is 2105143409. The reversal of 2105143405 is 5043415012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 643839876 + 1461303529 = 25374^2 + 38227^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2105143405 - 2⁷ = 2105143277 is a prime.

It is a super-2 number, since 2×2105143405² = 8863257511229988050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2105143405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2105143409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12383112 + ... + 12383281.

It is an arithmetic number, because the mean of its divisors is an integer number (334346319).

Almost surely, 2^2105143405 is an apocalyptic number.

It is an amenable number.

2105143405 is a deficient number, since it is larger than the sum of its proper divisors (569627147).

2105143405 is a wasteful number, since it uses less digits than its factorization.

2105143405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24766415.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 2105143405 is about 45881.8417786383. The cubic root of 2105143405 is about 1281.6237947093.

Adding to 2105143405 its reverse (5043415012), we get a palindrome (7148558417).

The spelling of 2105143405 in words is "two billion, one hundred five million, one hundred forty-three thousand, four hundred five".