2005656406 has 8 divisors (see below), whose sum is σ = 3239906544. Its totient is φ = 925687560.

The previous prime is 2005656391. The next prime is 2005656421. The reversal of 2005656406 is 6046565002.

It is an interprime number because it is at equal distance from previous prime (2005656391) and next prime (2005656421).

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 38570290 + ... + 38570341.

It is an arithmetic number, because the mean of its divisors is an integer number (404988318).

Almost surely, 2^2005656406 is an apocalyptic number.

2005656406 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2005656406 is a deficient number, since it is larger than the sum of its proper divisors (1234250138).

2005656406 is a wasteful number, since it uses less digits than its factorization.

2005656406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77140646.

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 2005656406 is about 44784.5554404641. Note that the first 3 decimals coincide. The cubic root of 2005656406 is about 1261.1077027296.

The spelling of 2005656406 in words is "two billion, five million, six hundred fifty-six thousand, four hundred six".