12388520 has 16 divisors (see below), whose sum is σ = 27874260. Its totient is φ = 4955392.

The previous prime is 12388511. The next prime is 12388547. The reversal of 12388520 is 2588321.

It can be written as a sum of positive squares in 2 ways, for example, as 12124324 + 264196 = 3482^2 + 514^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154817 + ... + 154896.

Almost surely, 2^12388520 is an apocalyptic number.

12388520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12388520 is an abundant number, since it is smaller than the sum of its proper divisors (15485740).

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

12388520 is a wasteful number, since it uses less digits than its factorization.

12388520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309724 (or 309720 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 12388520 is about 3519.7329444150. The cubic root of 12388520 is about 231.3874546822.

The spelling of 12388520 in words is "twelve million, three hundred eighty-eight thousand, five hundred twenty".