12215869 has 4 divisors (see below), whose sum is σ = 12330144. Its totient is φ = 12101596.

The previous prime is 12215851. The next prime is 12215897. The reversal of 12215869 is 96851221.

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 an emirpimes, since its reverse is a distinct semiprime: 96851221 = 257 ⋅376853.

It is a cyclic number.

It is not a de Polignac number, because 12215869 - 2¹¹ = 12213821 is a prime.

It is a super-2 number, since 2×12215869² = 298454910850322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12215899) 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, 56977 + ... + 57190.

It is an arithmetic number, because the mean of its divisors is an integer number (3082536).

Almost surely, 2^12215869 is an apocalyptic number.

It is an amenable number.

12215869 is a deficient number, since it is larger than the sum of its proper divisors (114275).

12215869 is a wasteful number, since it uses less digits than its factorization.

12215869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114274.

The product of its digits is 8640, while the sum is 34.

The square root of 12215869 is about 3495.1207418343. The cubic root of 12215869 is about 230.3075218515.

The spelling of 12215869 in words is "twelve million, two hundred fifteen thousand, eight hundred sixty-nine".