12215888 has 10 divisors (see below), whose sum is σ = 23668314. Its totient is φ = 6107936.

The previous prime is 12215851. The next prime is 12215897. The reversal of 12215888 is 88851221.

It can be written as a sum of positive squares in only one way, i.e., 11888704 + 327184 = 3448^2 + 572^2 .

It is a nialpdrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 381731 + ... + 381762.

Almost surely, 2^12215888 is an apocalyptic number.

It is an amenable number.

12215888 is a deficient number, since it is larger than the sum of its proper divisors (11452426).

12215888 is an equidigital number, since it uses as much as digits as its factorization.

12215888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 763501 (or 763495 counting only the distinct ones).

The product of its digits is 10240, while the sum is 35.

The square root of 12215888 is about 3495.1234599081. The cubic root of 12215888 is about 230.3076412547.

The spelling of 12215888 in words is "twelve million, two hundred fifteen thousand, eight hundred eighty-eight".