12109440 has 256 divisors, whose sum is σ = 47589120. Its totient is φ = 2555904.

The previous prime is 12109417. The next prime is 12109463. The reversal of 12109440 is 4490121.

It is an interprime number because it is at equal distance from previous prime (12109417) and next prime (12109463).

It is a super-2 number, since 2×12109440² = 293277074227200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

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, 228454 + ... + 228506.

It is an arithmetic number, because the mean of its divisors is an integer number (185895).

Almost surely, 2^12109440 is an apocalyptic number.

12109440 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 12109440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23794560).

12109440 is an abundant number, since it is smaller than the sum of its proper divisors (35479680).

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

12109440 is a wasteful number, since it uses less digits than its factorization.

12109440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99 (or 87 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 12109440 is about 3479.8620662319. The cubic root of 12109440 is about 229.6367296272.

Adding to 12109440 its reverse (4490121), we get a palindrome (16599561).

The spelling of 12109440 in words is "twelve million, one hundred nine thousand, four hundred forty".