2808390 has 64 divisors (see below), whose sum is σ = 7660800. Its totient is φ = 653184.

The previous prime is 2808361. The next prime is 2808397. The reversal of 2808390 is 938082.

2808390 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2808397) 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 31 ways as a sum of consecutive naturals, for example, 7221 + ... + 7599.

It is an arithmetic number, because the mean of its divisors is an integer number (119700).

2^2808390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2808390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3830400).

2808390 is an abundant number, since it is smaller than the sum of its proper divisors (4852410).

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

2808390 is a wasteful number, since it uses less digits than its factorization.

2808390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 2808390 is about 1675.8251698790. The cubic root of 2808390 is about 141.0866124461.

The spelling of 2808390 in words is "two million, eight hundred eight thousand, three hundred ninety".