4278565 has 4 divisors (see below), whose sum is σ = 5134284. Its totient is φ = 3422848.

The previous prime is 4278563. The next prime is 4278607. The reversal of 4278565 is 5658724.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 777924 + 3500641 = 882^2 + 1871^2 .

It is a cyclic number.

It is not a de Polignac number, because 4278565 - 2¹ = 4278563 is a prime.

It is a super-2 number, since 2×4278565² = 36612236918450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4278563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 427852 + ... + 427861.

It is an arithmetic number, because the mean of its divisors is an integer number (1283571).

Almost surely, 2^4278565 is an apocalyptic number.

It is an amenable number.

4278565 is a deficient number, since it is larger than the sum of its proper divisors (855719).

4278565 is an equidigital number, since it uses as much as digits as its factorization.

4278565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855718.

The product of its digits is 67200, while the sum is 37.

The square root of 4278565 is about 2068.4692407672. The cubic root of 4278565 is about 162.3426800913.

The spelling of 4278565 in words is "four million, two hundred seventy-eight thousand, five hundred sixty-five".