8219666 has 32 divisors (see below), whose sum is σ = 15980160. Its totient is φ = 3079296.

The previous prime is 8219657. The next prime is 8219711. The reversal of 8219666 is 6669128.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2270 + ... + 4646.

It is an arithmetic number, because the mean of its divisors is an integer number (499380).

Almost surely, 2^8219666 is an apocalyptic number.

8219666 is a deficient number, since it is larger than the sum of its proper divisors (7760494).

8219666 is a wasteful number, since it uses less digits than its factorization.

8219666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2418.

The product of its digits is 31104, while the sum is 38.

The square root of 8219666 is about 2866.9959888357. The cubic root of 8219666 is about 201.8140464311.

The spelling of 8219666 in words is "eight million, two hundred nineteen thousand, six hundred sixty-six".