12643432 has 8 divisors (see below), whose sum is σ = 23706450. Its totient is φ = 6321712.

The previous prime is 12643387. The next prime is 12643439. The reversal of 12643432 is 23434621.

It can be written as a sum of positive squares in only one way, i.e., 11655396 + 988036 = 3414^2 + 994^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 12643397 and 12643406.

It is not an unprimeable number, because it can be changed into a prime (12643439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 790207 + ... + 790222.

Almost surely, 2^12643432 is an apocalyptic number.

It is an amenable number.

12643432 is a deficient number, since it is larger than the sum of its proper divisors (11063018).

12643432 is a wasteful number, since it uses less digits than its factorization.

12643432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580435 (or 1580431 counting only the distinct ones).

The product of its digits is 3456, while the sum is 25.

The square root of 12643432 is about 3555.7603968772. The cubic root of 12643432 is about 232.9637377793.

The spelling of 12643432 in words is "twelve million, six hundred forty-three thousand, four hundred thirty-two".