12280340 has 48 divisors (see below), whose sum is σ = 27578880. Its totient is φ = 4583040.

The previous prime is 12280271. The next prime is 12280343. The reversal of 12280340 is 4308221.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12280343) by changing a digit.

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, 17639 + ... + 18321.

It is an arithmetic number, because the mean of its divisors is an integer number (574560).

Almost surely, 2^12280340 is an apocalyptic number.

12280340 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 12280340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13789440).

12280340 is an abundant number, since it is smaller than the sum of its proper divisors (15298540).

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

12280340 is a wasteful number, since it uses less digits than its factorization.

12280340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 752 (or 750 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 12280340 is about 3504.3316053136. The cubic root of 12280340 is about 230.7119714918.

Adding to 12280340 its reverse (4308221), we get a palindrome (16588561).

The spelling of 12280340 in words is "twelve million, two hundred eighty thousand, three hundred forty".