12215955 has 16 divisors (see below), whose sum is σ = 20574720. Its totient is φ = 6172128.

The previous prime is 12215947. The next prime is 12215971. The reversal of 12215955 is 55951221.

It is not a de Polignac number, because 12215955 - 2³ = 12215947 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21147 + ... + 21716.

It is an arithmetic number, because the mean of its divisors is an integer number (1285920).

Almost surely, 2^12215955 is an apocalyptic number.

12215955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12215955 is a deficient number, since it is larger than the sum of its proper divisors (8358765).

12215955 is a wasteful number, since it uses less digits than its factorization.

12215955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42890.

The product of its digits is 4500, while the sum is 30.

The square root of 12215955 is about 3495.1330446780. The cubic root of 12215955 is about 230.3080623070.

The spelling of 12215955 in words is "twelve million, two hundred fifteen thousand, nine hundred fifty-five".