2278386 has 48 divisors (see below), whose sum is σ = 5548608. Its totient is φ = 669600.

The previous prime is 2278379. The next prime is 2278421. The reversal of 2278386 is 6838722.

It is a happy number.

2278386 is a `hidden beast` number, since 2 + 278 + 386 = 666.

2278386 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a d-powerful number, because it can be written as 2¹⁷ + 2²¹ + 7⁴ + 8³ + 3⁴ + 8³ + 6⁶ .

It is a self number, because there is not a number n which added to its sum of digits gives 2278386.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 7171 + ... + 7481.

It is an arithmetic number, because the mean of its divisors is an integer number (115596).

2^2278386 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2278386, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2774304).

2278386 is an abundant number, since it is smaller than the sum of its proper divisors (3270222).

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

2278386 is a wasteful number, since it uses less digits than its factorization.

2278386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367 (or 364 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 2278386 is about 1509.4323436312. The cubic root of 2278386 is about 131.5858230063.

The spelling of 2278386 in words is "two million, two hundred seventy-eight thousand, three hundred eighty-six".