8440668 has 18 divisors (see below), whose sum is σ = 21336224. Its totient is φ = 2813544.

The previous prime is 8440667. The next prime is 8440669. The reversal of 8440668 is 8660448.

It is an interprime number because it is at equal distance from previous prime (8440667) and next prime (8440669).

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 234463 = 8440668 / (8 + 4 + 4 + 0 + 6 + 6 + 8).

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 117196 + ... + 117267.

Almost surely, 2^8440668 is an apocalyptic number.

It is an amenable number.

8440668 is an abundant number, since it is smaller than the sum of its proper divisors (12895556).

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

8440668 is a wasteful number, since it uses less digits than its factorization.

8440668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234473 (or 234468 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 8440668 is about 2905.2827745333. The cubic root of 8440668 is about 203.6067973898.

The spelling of 8440668 in words is "eight million, four hundred forty thousand, six hundred sixty-eight".