12640534 has 8 divisors (see below), whose sum is σ = 19220760. Its totient is φ = 6233616.

The previous prime is 12640531. The next prime is 12640543. The reversal of 12640534 is 43504621.

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

It is a junction number, because it is equal to n+sod(n) for n = 12640499 and 12640508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12640531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43144 + ... + 43435.

It is an arithmetic number, because the mean of its divisors is an integer number (2402595).

Almost surely, 2^12640534 is an apocalyptic number.

12640534 is a deficient number, since it is larger than the sum of its proper divisors (6580226).

12640534 is an equidigital number, since it uses as much as digits as its factorization.

12640534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86654.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 12640534 is about 3555.3528657505. The cubic root of 12640534 is about 232.9459372195.

The spelling of 12640534 in words is "twelve million, six hundred forty thousand, five hundred thirty-four".