12215969 has 4 divisors (see below), whose sum is σ = 12225840. Its totient is φ = 12206100.

The previous prime is 12215947. The next prime is 12215971. The reversal of 12215969 is 96951221.

12215969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12215969 - 2⁸ = 12215713 is a prime.

It is a super-2 number, since 2×12215969² = 298459797217922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12215939) 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, 2759 + ... + 5660.

It is an arithmetic number, because the mean of its divisors is an integer number (3056460).

Almost surely, 2^12215969 is an apocalyptic number.

It is an amenable number.

12215969 is a deficient number, since it is larger than the sum of its proper divisors (9871).

12215969 is an equidigital number, since it uses as much as digits as its factorization.

12215969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9870.

The product of its digits is 9720, while the sum is 35.

The square root of 12215969 is about 3495.1350474624. The cubic root of 12215969 is about 230.3081502879.

The spelling of 12215969 in words is "twelve million, two hundred fifteen thousand, nine hundred sixty-nine".