8440666 has 8 divisors (see below), whose sum is σ = 13634964. Its totient is φ = 3895680.

The previous prime is 8440639. The next prime is 8440667. The reversal of 8440666 is 6660448.

It can be written as a sum of positive squares in 2 ways, for example, as 8242641 + 198025 = 2871^2 + 445^2 .

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

It is not an unprimeable number, because it can be changed into a prime (8440667) 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, 162295 + ... + 162346.

Almost surely, 2^8440666 is an apocalyptic number.

8440666 is a deficient number, since it is larger than the sum of its proper divisors (5194298).

8440666 is a wasteful number, since it uses less digits than its factorization.

8440666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324656.

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 8440666 is about 2905.2824303327. The cubic root of 8440666 is about 203.6067813084.

The spelling of 8440666 in words is "eight million, four hundred forty thousand, six hundred sixty-six".