12215455 has 24 divisors (see below), whose sum is σ = 17310672. Its totient is φ = 8249472.

The previous prime is 12215449. The next prime is 12215473. The reversal of 12215455 is 55451221.

It is not a de Polignac number, because 12215455 - 2⁷ = 12215327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17544 + ... + 18226.

It is an arithmetic number, because the mean of its divisors is an integer number (721278).

Almost surely, 2^12215455 is an apocalyptic number.

12215455 is a deficient number, since it is larger than the sum of its proper divisors (5095217).

12215455 is an equidigital number, since it uses as much as digits as its factorization.

12215455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775 (or 768 counting only the distinct ones).

The product of its digits is 2000, while the sum is 25.

The square root of 12215455 is about 3495.0615159107. The cubic root of 12215455 is about 230.3049200884.

Adding to 12215455 its reverse (55451221), we get a palindrome (67666676).

The spelling of 12215455 in words is "twelve million, two hundred fifteen thousand, four hundred fifty-five".