12217740 has 48 divisors (see below), whose sum is σ = 34454112. Its totient is φ = 3234816.

The previous prime is 12217717. The next prime is 12217753. The reversal of 12217740 is 4771221.

It is a self number, because there is not a number n which added to its sum of digits gives 12217740.

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, 8772 + ... + 10068.

It is an arithmetic number, because the mean of its divisors is an integer number (717794).

Almost surely, 2^12217740 is an apocalyptic number.

12217740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12217740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17227056).

12217740 is an abundant number, since it is smaller than the sum of its proper divisors (22236372).

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

12217740 is a wasteful number, since it uses less digits than its factorization.

12217740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1466 (or 1464 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 24.

The square root of 12217740 is about 3495.3883904367. The cubic root of 12217740 is about 230.3192793279.

Adding to 12217740 its reverse (4771221), we get a palindrome (16988961).

The spelling of 12217740 in words is "twelve million, two hundred seventeen thousand, seven hundred forty".