8166215 has 4 divisors (see below), whose sum is σ = 9799464. Its totient is φ = 6532968.

The previous prime is 8166211. The next prime is 8166217. The reversal of 8166215 is 5126618.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 8166215 - 2² = 8166211 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8166211) 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, 816617 + ... + 816626.

It is an arithmetic number, because the mean of its divisors is an integer number (2449866).

Almost surely, 2^8166215 is an apocalyptic number.

8166215 is a deficient number, since it is larger than the sum of its proper divisors (1633249).

8166215 is a wasteful number, since it uses less digits than its factorization.

8166215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1633248.

The product of its digits is 2880, while the sum is 29.

The square root of 8166215 is about 2857.6590069496. The cubic root of 8166215 is about 201.3756413605.

The spelling of 8166215 in words is "eight million, one hundred sixty-six thousand, two hundred fifteen".