12181456 has 40 divisors (see below), whose sum is σ = 27430784. Its totient is φ = 5132160.

The previous prime is 12181447. The next prime is 12181457. The reversal of 12181456 is 65418121.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12181457) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5941 + ... + 7723.

Almost surely, 2^12181456 is an apocalyptic number.

12181456 is a gapful number since it is divisible by the number (16) 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 12181456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13715392).

12181456 is an abundant number, since it is smaller than the sum of its proper divisors (15249328).

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

12181456 is a wasteful number, since it uses less digits than its factorization.

12181456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1859 (or 1853 counting only the distinct ones).

The product of its digits is 1920, while the sum is 28.

The square root of 12181456 is about 3490.1942639343. The cubic root of 12181456 is about 230.0910540552.

Adding to 12181456 its reverse (65418121), we get a palindrome (77599577).

The spelling of 12181456 in words is "twelve million, one hundred eighty-one thousand, four hundred fifty-six".