2005399836 has 48 divisors (see below), whose sum is σ = 5671841280. Its totient is φ = 607696560.

The previous prime is 2005399819. The next prime is 2005399861. The reversal of 2005399836 is 6389935002.

2005399836 is a `hidden beast` number, since 20 + 0 + 539 + 98 + 3 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 2005399791 and 2005399800.

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 15 ways as a sum of consecutive naturals, for example, 842836 + ... + 845211.

It is an arithmetic number, because the mean of its divisors is an integer number (118163360).

Almost surely, 2^2005399836 is an apocalyptic number.

It is an amenable number.

2005399836 is an abundant number, since it is smaller than the sum of its proper divisors (3666441444).

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

2005399836 is a wasteful number, since it uses less digits than its factorization.

2005399836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1688071 (or 1688063 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The square root of 2005399836 is about 44781.6908568669. The cubic root of 2005399836 is about 1261.0539254558.

The spelling of 2005399836 in words is "two billion, five million, three hundred ninety-nine thousand, eight hundred thirty-six".