12445520 has 20 divisors (see below), whose sum is σ = 28936020. Its totient is φ = 4978176.

The previous prime is 12445501. The next prime is 12445529. The reversal of 12445520 is 2554421.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2383936 + 10061584 = 1544^2 + 3172^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12445529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77705 + ... + 77864.

It is an arithmetic number, because the mean of its divisors is an integer number (1446801).

Almost surely, 2^12445520 is an apocalyptic number.

12445520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12445520 is an abundant number, since it is smaller than the sum of its proper divisors (16490500).

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

12445520 is a wasteful number, since it uses less digits than its factorization.

12445520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155582 (or 155576 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 12445520 is about 3527.8208571298. The cubic root of 12445520 is about 231.7417856449.

Adding to 12445520 its reverse (2554421), we get a palindrome (14999941).

The spelling of 12445520 in words is "twelve million, four hundred forty-five thousand, five hundred twenty".