2005818840 has 96 divisors (see below), whose sum is σ = 6695142480. Its totient is φ = 520425216.

The previous prime is 2005818839. The next prime is 2005818863. The reversal of 2005818840 is 488185002.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 2005818795 and 2005818804.

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 23 ways as a sum of consecutive naturals, for example, 61974 + ... + 88613.

Almost surely, 2^2005818840 is an apocalyptic number.

2005818840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2005818840 is an abundant number, since it is smaller than the sum of its proper divisors (4689323640).

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

2005818840 is a wasteful number, since it uses less digits than its factorization.

2005818840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150641 (or 150634 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 2005818840 is about 44786.3689084078. The cubic root of 2005818840 is about 1261.1417466530.

The spelling of 2005818840 in words is "two billion, five million, eight hundred eighteen thousand, eight hundred forty".