12640936 has 32 divisors (see below), whose sum is σ = 29551680. Its totient is φ = 4924800.

The previous prime is 12640931. The next prime is 12640951. The reversal of 12640936 is 63904621.

It is a junction number, because it is equal to n+sod(n) for n = 12640898 and 12640907.

It is not an unprimeable number, because it can be changed into a prime (12640931) 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, 9645 + ... + 10876.

It is an arithmetic number, because the mean of its divisors is an integer number (923490).

Almost surely, 2^12640936 is an apocalyptic number.

It is an amenable number.

12640936 is an abundant number, since it is smaller than the sum of its proper divisors (16910744).

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

12640936 is a wasteful number, since it uses less digits than its factorization.

12640936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20545 (or 20541 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 12640936 is about 3555.4093997738. The cubic root of 12640936 is about 232.9484066108.

The spelling of 12640936 in words is "twelve million, six hundred forty thousand, nine hundred thirty-six".