2105778 has 8 divisors (see below), whose sum is σ = 4211568. Its totient is φ = 701924.

The previous prime is 2105767. The next prime is 2105809. The reversal of 2105778 is 8775012.

It is a happy number.

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

2105778 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175476 + ... + 175487.

It is an arithmetic number, because the mean of its divisors is an integer number (526446).

2^2105778 is an apocalyptic number.

2105778 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.

2105778 is a wasteful number, since it uses less digits than its factorization.

2105778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350968.

The product of its (nonzero) digits is 3920, while the sum is 30.

The square root of 2105778 is about 1451.1299045916. The cubic root of 2105778 is about 128.1752563505.

The spelling of 2105778 in words is "two million, one hundred five thousand, seven hundred seventy-eight".