8661215 has 8 divisors (see below), whose sum is σ = 10431888. Its totient is φ = 6903360.

The previous prime is 8661203. The next prime is 8661217. The reversal of 8661215 is 5121668.

It is a happy number.

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

It is not a de Polignac number, because 8661215 - 2²² = 4466911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8661217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1646 + ... + 4475.

It is an arithmetic number, because the mean of its divisors is an integer number (1303986).

Almost surely, 2^8661215 is an apocalyptic number.

8661215 is a deficient number, since it is larger than the sum of its proper divisors (1770673).

8661215 is a wasteful number, since it uses less digits than its factorization.

8661215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6409.

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

The square root of 8661215 is about 2942.9942235757. The cubic root of 8661215 is about 205.3649260458.

The spelling of 8661215 in words is "eight million, six hundred sixty-one thousand, two hundred fifteen".