12445821 has 12 divisors (see below), whose sum is σ = 18099900. Its totient is φ = 8240640.

The previous prime is 12445781. The next prime is 12445841. The reversal of 12445821 is 12854421.

12445821 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 6320196 + 6125625 = 2514^2 + 2475^2 .

It is not a de Polignac number, because 12445821 - 2⁶ = 12445757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12445841) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3300 + ... + 5981.

It is an arithmetic number, because the mean of its divisors is an integer number (1508325).

Almost surely, 2^12445821 is an apocalyptic number.

It is an amenable number.

12445821 is a deficient number, since it is larger than the sum of its proper divisors (5654079).

12445821 is a wasteful number, since it uses less digits than its factorization.

12445821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9436 (or 9433 counting only the distinct ones).

The product of its digits is 2560, while the sum is 27.

The square root of 12445821 is about 3527.8635177682. The cubic root of 12445821 is about 231.7436538865.

The spelling of 12445821 in words is "twelve million, four hundred forty-five thousand, eight hundred twenty-one".