2806388 has 24 divisors (see below), whose sum is σ = 5474280. Its totient is φ = 1249920.

The previous prime is 2806387. The next prime is 2806439. The reversal of 2806388 is 8836082.

2806388 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 77284 + 2729104 = 278^2 + 1652^2 .

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2806381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 578 + ... + 2438.

It is an arithmetic number, because the mean of its divisors is an integer number (228095).

2^2806388 is an apocalyptic number.

It is an amenable number.

2806388 is a deficient number, since it is larger than the sum of its proper divisors (2667892).

2806388 is a wasteful number, since it uses less digits than its factorization.

2806388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1907 (or 1905 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 2806388 is about 1675.2277457110. The cubic root of 2806388 is about 141.0530792899.

The spelling of 2806388 in words is "two million, eight hundred six thousand, three hundred eighty-eight".