12771432 has 40 divisors (see below), whose sum is σ = 35773650. Its totient is φ = 4256928.

The previous prime is 12771431. The next prime is 12771457. The reversal of 12771432 is 23417721.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 10850436 + 1920996 = 3294^2 + 1386^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 12771396 and 12771405.

It is not an unprimeable number, because it can be changed into a prime (12771431) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 9207 + ... + 10502.

Almost surely, 2^12771432 is an apocalyptic number.

12771432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12771432 is an abundant number, since it is smaller than the sum of its proper divisors (23002218).

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

12771432 is a wasteful number, since it uses less digits than its factorization.

12771432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19727 (or 19714 counting only the distinct ones).

The product of its digits is 2352, while the sum is 27.

The square root of 12771432 is about 3573.7140344465. The cubic root of 12771432 is about 233.7472616378.

It can be divided in two parts, 12771 and 432, that added together give a triangular number (13203 = T₁₆₂).

The spelling of 12771432 in words is "twelve million, seven hundred seventy-one thousand, four hundred thirty-two".