12643516 has 6 divisors (see below), whose sum is σ = 22126160. Its totient is φ = 6321756.

The previous prime is 12643513. The next prime is 12643541. The reversal of 12643516 is 61534621.

12643516 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12643511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1580436 + ... + 1580443.

Almost surely, 2^12643516 is an apocalyptic number.

It is an amenable number.

12643516 is a deficient number, since it is larger than the sum of its proper divisors (9482644).

12643516 is a wasteful number, since it uses less digits than its factorization.

12643516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3160883 (or 3160881 counting only the distinct ones).

The product of its digits is 4320, while the sum is 28.

The square root of 12643516 is about 3555.7722086770. The cubic root of 12643516 is about 232.9642536970.

It can be divided in two parts, 126 and 43516, that multiplied together give a triangular number (5483016 = T₃₃₁₁).

The spelling of 12643516 in words is "twelve million, six hundred forty-three thousand, five hundred sixteen".