2820390 has 32 divisors (see below), whose sum is σ = 6937056. Its totient is φ = 733440.

The previous prime is 2820383. The next prime is 2820401. The reversal of 2820390 is 930282.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2820390.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84 + ... + 2376.

It is an arithmetic number, because the mean of its divisors is an integer number (216783).

2^2820390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2820390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3468528).

2820390 is an abundant number, since it is smaller than the sum of its proper divisors (4116666).

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

2820390 is a wasteful number, since it uses less digits than its factorization.

2820390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2344.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 2820390 is about 1679.4016791703. The cubic root of 2820390 is about 141.2872770802.

The spelling of 2820390 in words is "two million, eight hundred twenty thousand, three hundred ninety".