8243665 has 8 divisors (see below), whose sum is σ = 10133928. Its totient is φ = 6433920.

The previous prime is 8243647. The next prime is 8243681. The reversal of 8243665 is 5663428.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1024 + 8242641 = 32^2 + 2871^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8243665 - 2⁵ = 8243633 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8243665.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19902 + ... + 20311.

It is an arithmetic number, because the mean of its divisors is an integer number (1266741).

Almost surely, 2^8243665 is an apocalyptic number.

It is an amenable number.

8243665 is a deficient number, since it is larger than the sum of its proper divisors (1890263).

8243665 is a wasteful number, since it uses less digits than its factorization.

8243665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40259.

The product of its digits is 34560, while the sum is 34.

The square root of 8243665 is about 2871.1783295365. The cubic root of 8243665 is about 202.0102680792.

It can be divided in two parts, 824 and 3665, that added together give a square (4489 = 67²).

The spelling of 8243665 in words is "eight million, two hundred forty-three thousand, six hundred sixty-five".