12210640 has 80 divisors (see below), whose sum is σ = 31248000. Its totient is φ = 4409856.

The previous prime is 12210619. The next prime is 12210659. The reversal of 12210640 is 4601221.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (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 in 15 ways as a sum of consecutive naturals, for example, 61261 + ... + 61459.

It is an arithmetic number, because the mean of its divisors is an integer number (390600).

Almost surely, 2^12210640 is an apocalyptic number.

12210640 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 12210640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15624000).

12210640 is an abundant number, since it is smaller than the sum of its proper divisors (19037360).

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

12210640 is a wasteful number, since it uses less digits than its factorization.

12210640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284 (or 278 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 12210640 is about 3494.3726189403. The cubic root of 12210640 is about 230.2746561339.

Adding to 12210640 its reverse (4601221), we get a palindrome (16811861).

The spelling of 12210640 in words is "twelve million, two hundred ten thousand, six hundred forty".