12781472 has 36 divisors (see below), whose sum is σ = 27667458. Its totient is φ = 5808000.

The previous prime is 12781459. The next prime is 12781487. The reversal of 12781472 is 27418721.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12082576 + 698896 = 3476^2 + 836^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

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

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2222 + ... + 5522.

Almost surely, 2^12781472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12781472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13833729).

12781472 is an abundant number, since it is smaller than the sum of its proper divisors (14885986).

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

12781472 is a wasteful number, since it uses less digits than its factorization.

12781472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3333 (or 3314 counting only the distinct ones).

The product of its digits is 6272, while the sum is 32.

The square root of 12781472 is about 3575.1184595759. The cubic root of 12781472 is about 233.8084974701.

The spelling of 12781472 in words is "twelve million, seven hundred eighty-one thousand, four hundred seventy-two".