12215643 has 16 divisors (see below), whose sum is σ = 18342912. Its totient is φ = 7164000.

The previous prime is 12215633. The next prime is 12215653. The reversal of 12215643 is 34651221.

It is an interprime number because it is at equal distance from previous prime (12215633) and next prime (12215653).

It is not a de Polignac number, because 12215643 - 2⁵ = 12215611 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12215633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4948 + ... + 6993.

It is an arithmetic number, because the mean of its divisors is an integer number (1146432).

Almost surely, 2^12215643 is an apocalyptic number.

12215643 is a deficient number, since it is larger than the sum of its proper divisors (6127269).

12215643 is a wasteful number, since it uses less digits than its factorization.

12215643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11986.

The product of its digits is 1440, while the sum is 24.

The square root of 12215643 is about 3495.0884108989. The cubic root of 12215643 is about 230.3061015727.

Adding to 12215643 its reverse (34651221), we get a palindrome (46866864).

The spelling of 12215643 in words is "twelve million, two hundred fifteen thousand, six hundred forty-three".