12215889 has 24 divisors (see below), whose sum is σ = 20384000. Its totient is φ = 6905088.

The previous prime is 12215851. The next prime is 12215897. The reversal of 12215889 is 98851221.

12215889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12215889 - 2⁷ = 12215761 is a prime.

It is a Curzon number.

It is a nialpdrome in base 16.

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 23 ways as a sum of consecutive naturals, for example, 5112 + ... + 7110.

Almost surely, 2^12215889 is an apocalyptic number.

It is an amenable number.

12215889 is a deficient number, since it is larger than the sum of its proper divisors (8168111).

12215889 is a wasteful number, since it uses less digits than its factorization.

12215889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2109 (or 2106 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 12215889 is about 3495.1236029646. The cubic root of 12215889 is about 230.3076475390.

The spelling of 12215889 in words is "twelve million, two hundred fifteen thousand, eight hundred eighty-nine".