12399776 has 12 divisors (see below), whose sum is σ = 24412122. Its totient is φ = 6199872.

The previous prime is 12399769. The next prime is 12399787. The reversal of 12399776 is 67799321.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 8880400 + 3519376 = 2980^2 + 1876^2 .

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

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, 193715 + ... + 193778.

Almost surely, 2^12399776 is an apocalyptic number.

12399776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12399776 is a deficient number, since it is larger than the sum of its proper divisors (12012346).

12399776 is an equidigital number, since it uses as much as digits as its factorization.

12399776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387503 (or 387495 counting only the distinct ones).

The product of its digits is 142884, while the sum is 44.

The square root of 12399776 is about 3521.3315663254. The cubic root of 12399776 is about 231.4575117132.

It can be divided in two parts, 123 and 99776, that added together give a palindrome (99899).

The spelling of 12399776 in words is "twelve million, three hundred ninety-nine thousand, seven hundred seventy-six".