12665500 has 48 divisors (see below), whose sum is σ = 28121184. Its totient is φ = 4982400.

The previous prime is 12665467. The next prime is 12665509. The reversal of 12665500 is 556621.

12665500 = 380² + 381² + ... + 452².

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12665509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36327 + ... + 36673.

It is an arithmetic number, because the mean of its divisors is an integer number (585858).

Almost surely, 2^12665500 is an apocalyptic number.

12665500 is a gapful number since it is divisible by the number (10) 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 12665500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14060592).

12665500 is an abundant number, since it is smaller than the sum of its proper divisors (15455684).

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

12665500 is a wasteful number, since it uses less digits than its factorization.

12665500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439 (or 427 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 12665500 is about 3558.8621777192. The cubic root of 12665500 is about 233.0991982456.

The spelling of 12665500 in words is "twelve million, six hundred sixty-five thousand, five hundred".