12564138 has 8 divisors (see below), whose sum is σ = 25128288. Its totient is φ = 4188044.

The previous prime is 12564137. The next prime is 12564143. The reversal of 12564138 is 83146521.

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

12564138 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (12564137) 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, 1047006 + ... + 1047017.

It is an arithmetic number, because the mean of its divisors is an integer number (3141036).

Almost surely, 2^12564138 is an apocalyptic number.

12564138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

12564138 is a wasteful number, since it uses less digits than its factorization.

12564138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2094028.

The product of its digits is 5760, while the sum is 30.

The square root of 12564138 is about 3544.5927833815. The cubic root of 12564138 is about 232.4757010101.

The spelling of 12564138 in words is "twelve million, five hundred sixty-four thousand, one hundred thirty-eight".