12509812 has 24 divisors (see below), whose sum is σ = 25141760. Its totient is φ = 5335200.

The previous prime is 12509779. The next prime is 12509813. The reversal of 12509812 is 21890521.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12509813) 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, 5437 + ... + 7387.

Almost surely, 2^12509812 is an apocalyptic number.

It is an amenable number.

12509812 is an abundant number, since it is smaller than the sum of its proper divisors (12631948).

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

12509812 is a wasteful number, since it uses less digits than its factorization.

12509812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2191 (or 2189 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 12509812 is about 3536.9212600792. The cubic root of 12509812 is about 232.1401501583.

The spelling of 12509812 in words is "twelve million, five hundred nine thousand, eight hundred twelve".