2005639916 has 12 divisors (see below), whose sum is σ = 4011279888. Its totient is φ = 859559952.

The previous prime is 2005639907. The next prime is 2005639919. The reversal of 2005639916 is 6199365002.

2005639916 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (2005639919) 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, 35814971 + ... + 35815026.

It is an arithmetic number, because the mean of its divisors is an integer number (334273324).

Almost surely, 2^2005639916 is an apocalyptic number.

It is an amenable number.

2005639916 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2005639916 is a wasteful number, since it uses less digits than its factorization.

2005639916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71630008 (or 71630006 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 41.

The square root of 2005639916 is about 44784.3713364383. The cubic root of 2005639916 is about 1261.1042465506.

The spelling of 2005639916 in words is "two billion, five million, six hundred thirty-nine thousand, nine hundred sixteen".