12378644 has 6 divisors (see below), whose sum is σ = 21662634. Its totient is φ = 6189320.

The previous prime is 12378631. The next prime is 12378647. The reversal of 12378644 is 44687321.

It can be written as a sum of positive squares in only one way, i.e., 11971600 + 407044 = 3460^2 + 638^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12378647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1547327 + ... + 1547334.

It is an arithmetic number, because the mean of its divisors is an integer number (3610439).

Almost surely, 2^12378644 is an apocalyptic number.

It is an amenable number.

12378644 is a deficient number, since it is larger than the sum of its proper divisors (9283990).

12378644 is a wasteful number, since it uses less digits than its factorization.

12378644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3094665 (or 3094663 counting only the distinct ones).

The product of its digits is 32256, while the sum is 35.

The square root of 12378644 is about 3518.3297173517. The cubic root of 12378644 is about 231.3259517743.

The spelling of 12378644 in words is "twelve million, three hundred seventy-eight thousand, six hundred forty-four".