12215287 has 6 divisors (see below), whose sum is σ = 13970904. Its totient is φ = 10462320.

The previous prime is 12215279. The next prime is 12215297. The reversal of 12215287 is 78251221.

It is not a de Polignac number, because 12215287 - 2³ = 12215279 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 (12215237) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8587 + ... + 9907.

It is an arithmetic number, because the mean of its divisors is an integer number (2328484).

Almost surely, 2^12215287 is an apocalyptic number.

12215287 is a deficient number, since it is larger than the sum of its proper divisors (1755617).

12215287 is an frugal number, since it uses more digits than its factorization.

12215287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2649 (or 1328 counting only the distinct ones).

The product of its digits is 2240, while the sum is 28.

The square root of 12215287 is about 3495.0374819163. The cubic root of 12215287 is about 230.3038642837.

Multiplying 12215287 by its sum of digits (28), we get a square (342028036 = 18494²).

The spelling of 12215287 in words is "twelve million, two hundred fifteen thousand, two hundred eighty-seven".