12206815 has 4 divisors (see below), whose sum is σ = 14648184. Its totient is φ = 9765448.

The previous prime is 12206791. The next prime is 12206827. The reversal of 12206815 is 51860221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51860221 = 7 ⋅7408603.

It is a cyclic number.

It is not a de Polignac number, because 12206815 - 2¹¹ = 12204767 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12206815.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1220677 + ... + 1220686.

It is an arithmetic number, because the mean of its divisors is an integer number (3662046).

Almost surely, 2^12206815 is an apocalyptic number.

12206815 is a deficient number, since it is larger than the sum of its proper divisors (2441369).

12206815 is an equidigital number, since it uses as much as digits as its factorization.

12206815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2441368.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 12206815 is about 3493.8252675256. The cubic root of 12206815 is about 230.2506090038.

The spelling of 12206815 in words is "twelve million, two hundred six thousand, eight hundred fifteen".