12521388 has 48 divisors (see below), whose sum is σ = 32981760. Its totient is φ = 3662400.

The previous prime is 12521381. The next prime is 12521447. The reversal of 12521388 is 88312521.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12521381) 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, 2193 + ... + 5463.

It is an arithmetic number, because the mean of its divisors is an integer number (687120).

Almost surely, 2^12521388 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12521388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16490880).

12521388 is an abundant number, since it is smaller than the sum of its proper divisors (20460372).

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

12521388 is a wasteful number, since it uses less digits than its factorization.

12521388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3318 (or 3316 counting only the distinct ones).

The product of its digits is 3840, while the sum is 30.

The square root of 12521388 is about 3538.5573331515. The cubic root of 12521388 is about 232.2117319939.

The spelling of 12521388 in words is "twelve million, five hundred twenty-one thousand, three hundred eighty-eight".