2105454540 has 144 divisors (see below), whose sum is σ = 6874150752. Its totient is φ = 480098304.

The previous prime is 2105454511. The next prime is 2105454551. The reversal of 2105454540 is 454545012.

It is a super-2 number, since 2×2105454540² = 8865877640013223200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 2105454498 and 2105454507.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2154532 + ... + 2155508.

It is an arithmetic number, because the mean of its divisors is an integer number (47737158).

Almost surely, 2^2105454540 is an apocalyptic number.

2105454540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2105454540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3437075376).

2105454540 is an abundant number, since it is smaller than the sum of its proper divisors (4768696212).

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

2105454540 is a wasteful number, since it uses less digits than its factorization.

2105454540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1736 (or 1727 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 30.

The square root of 2105454540 is about 45885.2322648584. The cubic root of 2105454540 is about 1281.6869318768.

Adding to 2105454540 its reverse (454545012), we get a palindrome (2559999552).

The spelling of 2105454540 in words is "two billion, one hundred five million, four hundred fifty-four thousand, five hundred forty".