12212240 has 40 divisors (see below), whose sum is σ = 28545048. Its totient is φ = 4858880.

The previous prime is 12212237. The next prime is 12212279. The reversal of 12212240 is 4221221.

It can be written as a sum of positive squares in 4 ways, for example, as 2676496 + 9535744 = 1636^2 + 3088^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23180 + ... + 23700.

Almost surely, 2^12212240 is an apocalyptic number.

12212240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12212240 is an abundant number, since it is smaller than the sum of its proper divisors (16332808).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12212240 is a wasteful number, since it uses less digits than its factorization.

12212240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 827 (or 821 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 12212240 is about 3494.6015509640. The cubic root of 12212240 is about 230.2847135744.

Adding to 12212240 its reverse (4221221), we get a palindrome (16433461).

The spelling of 12212240 in words is "twelve million, two hundred twelve thousand, two hundred forty".