2099778 has 8 divisors (see below), whose sum is σ = 4199568. Its totient is φ = 699924.

The previous prime is 2099771. The next prime is 2099809. The reversal of 2099778 is 8779902.

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

2099778 is an admirable number.

It is a d-powerful number, because it can be written as 2⁷ + 0 + 9 + 9² + 7 + 7⁴ + 8⁷ .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2099771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174976 + ... + 174987.

It is an arithmetic number, because the mean of its divisors is an integer number (524946).

2^2099778 is an apocalyptic number.

2099778 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.

2099778 is a wasteful number, since it uses less digits than its factorization.

2099778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349968.

The product of its (nonzero) digits is 63504, while the sum is 42.

The square root of 2099778 is about 1449.0610753174. The cubic root of 2099778 is about 128.0534038227.

The spelling of 2099778 in words is "two million, ninety-nine thousand, seven hundred seventy-eight".