2278365 has 16 divisors (see below), whose sum is σ = 3668928. Its totient is φ = 1207296.

The previous prime is 2278361. The next prime is 2278379. The reversal of 2278365 is 5638722.

It is not a de Polignac number, because 2278365 - 2² = 2278361 is a prime.

It is a d-powerful number, because it can be written as 2¹⁷ + 2²¹ + 7³ + 8 + 3² + 6⁶ + 5⁵ .

2278365 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2278361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2502 + ... + 3288.

It is an arithmetic number, because the mean of its divisors is an integer number (229308).

2^2278365 is an apocalyptic number.

It is an amenable number.

2278365 is a deficient number, since it is larger than the sum of its proper divisors (1390563).

2278365 is a wasteful number, since it uses less digits than its factorization.

2278365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 988.

The product of its digits is 20160, while the sum is 33.

The square root of 2278365 is about 1509.4253873577. The cubic root of 2278365 is about 131.5854187273.

It can be divided in two parts, 22 and 78365, that added together give a palindrome (78387).

The spelling of 2278365 in words is "two million, two hundred seventy-eight thousand, three hundred sixty-five".