12665456 has 40 divisors (see below), whose sum is σ = 25903104. Its totient is φ = 5987520.

The previous prime is 12665449. The next prime is 12665461. The reversal of 12665456 is 65456621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46601 + ... + 46871.

Almost surely, 2^12665456 is an apocalyptic number.

12665456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12665456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12951552).

12665456 is an abundant number, since it is smaller than the sum of its proper divisors (13237648).

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

12665456 is a wasteful number, since it uses less digits than its factorization.

12665456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429 (or 423 counting only the distinct ones).

The product of its digits is 43200, while the sum is 35.

The square root of 12665456 is about 3558.8559959627. The cubic root of 12665456 is about 233.0989283161.

The spelling of 12665456 in words is "twelve million, six hundred sixty-five thousand, four hundred fifty-six".