12521385 has 40 divisors (see below), whose sum is σ = 22999680. Its totient is φ = 6513696.

The previous prime is 12521381. The next prime is 12521447. The reversal of 12521385 is 58312521.

It is a happy number.

It is not a de Polignac number, because 12521385 - 2² = 12521381 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 39 ways as a sum of consecutive naturals, for example, 17056 + ... + 17774.

It is an arithmetic number, because the mean of its divisors is an integer number (574992).

Almost surely, 2^12521385 is an apocalyptic number.

12521385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12521385 is a deficient number, since it is larger than the sum of its proper divisors (10478295).

12521385 is an equidigital number, since it uses as much as digits as its factorization.

12521385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779 (or 770 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 12521385 is about 3538.5569092499. The cubic root of 12521385 is about 232.2117134487.

The spelling of 12521385 in words is "twelve million, five hundred twenty-one thousand, three hundred eighty-five".