12815500 has 72 divisors (see below), whose sum is σ = 29955744. Its totient is φ = 4788000.

The previous prime is 12815489. The next prime is 12815503. The reversal of 12815500 is 551821.

It is not an unprimeable number, because it can be changed into a prime (12815503) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 180465 + ... + 180535.

It is an arithmetic number, because the mean of its divisors is an integer number (416052).

Almost surely, 2^12815500 is an apocalyptic number.

12815500 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 12815500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14977872).

12815500 is an abundant number, since it is smaller than the sum of its proper divisors (17140244).

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

12815500 is a wasteful number, since it uses less digits than its factorization.

12815500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128 (or 97 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 22.

The square root of 12815500 is about 3579.8742994692. The cubic root of 12815500 is about 234.0158023760.

The spelling of 12815500 in words is "twelve million, eight hundred fifteen thousand, five hundred".