2105758840 has 16 divisors (see below), whose sum is σ = 4737957480. Its totient is φ = 842303520.

The previous prime is 2105758829. The next prime is 2105758849. The reversal of 2105758840 is 488575012.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 52643971 = 2105758840 / (2 + 1 + 0 + 5 + 7 + 5 + 8 + 8 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 2105758793 and 2105758802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2105758849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26321946 + ... + 26322025.

Almost surely, 2^2105758840 is an apocalyptic number.

2105758840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2105758840 is an abundant number, since it is smaller than the sum of its proper divisors (2632198640).

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

2105758840 is a wasteful number, since it uses less digits than its factorization.

2105758840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52643982 (or 52643978 counting only the distinct ones).

The product of its (nonzero) digits is 89600, while the sum is 40.

The square root of 2105758840 is about 45888.5480267136. The cubic root of 2105758840 is about 1281.7486760336.

It can be divided in two parts, 21057 and 58840, that added together give a palindrome (79897).

The spelling of 2105758840 in words is "two billion, one hundred five million, seven hundred fifty-eight thousand, eight hundred forty".