12017640 has 128 divisors (see below), whose sum is σ = 39346560. Its totient is φ = 2924544.

The previous prime is 12017639. The next prime is 12017659. The reversal of 12017640 is 4671021.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87652 + ... + 87788.

It is an arithmetic number, because the mean of its divisors is an integer number (307395).

Almost surely, 2^12017640 is an apocalyptic number.

12017640 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 12017640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19673280).

12017640 is an abundant number, since it is smaller than the sum of its proper divisors (27328920).

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

12017640 is a wasteful number, since it uses less digits than its factorization.

12017640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211 (or 207 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 12017640 is about 3466.6467948148. The cubic root of 12017640 is about 229.0549755821.

Adding to 12017640 its reverse (4671021), we get a palindrome (16688661).

The spelling of 12017640 in words is "twelve million, seventeen thousand, six hundred forty".