2278206 has 80 divisors (see below), whose sum is σ = 6098400. Its totient is φ = 635040.

The previous prime is 2278189. The next prime is 2278207. The reversal of 2278206 is 6028722.

2278206 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 (27).

It is a self number, because there is not a number n which added to its sum of digits gives 2278206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2278207) 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 39 ways as a sum of consecutive naturals, for example, 55546 + ... + 55586.

It is an arithmetic number, because the mean of its divisors is an integer number (76230).

2^2278206 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2278206, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3049200).

2278206 is an abundant number, since it is smaller than the sum of its proper divisors (3820194).

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

2278206 is an equidigital number, since it uses as much as digits as its factorization.

2278206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76 (or 53 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 2278206 is about 1509.3727173896. The cubic root of 2278206 is about 131.5823576772.

The spelling of 2278206 in words is "two million, two hundred seventy-eight thousand, two hundred six".