12643431 has 8 divisors (see below), whose sum is σ = 16934400. Its totient is φ = 8390712.

The previous prime is 12643387. The next prime is 12643439. The reversal of 12643431 is 13434621.

12643431 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12643431 - 2⁹ = 12642919 is a prime.

It is a super-2 number, since 2×12643431² = 319712694903522, which contains 22 as substring.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 8781 + ... + 10118.

It is an arithmetic number, because the mean of its divisors is an integer number (2116800).

Almost surely, 2^12643431 is an apocalyptic number.

12643431 is a deficient number, since it is larger than the sum of its proper divisors (4290969).

12643431 is a wasteful number, since it uses less digits than its factorization.

12643431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19125.

The product of its digits is 1728, while the sum is 24.

The square root of 12643431 is about 3555.7602562603. The cubic root of 12643431 is about 232.9637316374.

The spelling of 12643431 in words is "twelve million, six hundred forty-three thousand, four hundred thirty-one".