12815444 has 6 divisors (see below), whose sum is σ = 22427034. Its totient is φ = 6407720.

The previous prime is 12815437. The next prime is 12815447. The reversal of 12815444 is 44451821.

It can be written as a sum of positive squares in only one way, i.e., 6959044 + 5856400 = 2638^2 + 2420^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12815447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1601927 + ... + 1601934.

It is an arithmetic number, because the mean of its divisors is an integer number (3737839).

Almost surely, 2^12815444 is an apocalyptic number.

It is an amenable number.

12815444 is a deficient number, since it is larger than the sum of its proper divisors (9611590).

12815444 is a wasteful number, since it uses less digits than its factorization.

12815444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3203865 (or 3203863 counting only the distinct ones).

The product of its digits is 5120, while the sum is 29.

The square root of 12815444 is about 3579.8664779570. The cubic root of 12815444 is about 234.0154615152.

The spelling of 12815444 in words is "twelve million, eight hundred fifteen thousand, four hundred forty-four".