12399556 has 24 divisors (see below), whose sum is σ = 23723840. Its totient is φ = 5635872.

The previous prime is 12399547. The next prime is 12399577. The reversal of 12399556 is 65599321.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1705 + ... + 5263.

Almost surely, 2^12399556 is an apocalyptic number.

It is an amenable number.

12399556 is a deficient number, since it is larger than the sum of its proper divisors (11324284).

12399556 is a wasteful number, since it uses less digits than its factorization.

12399556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3643 (or 3641 counting only the distinct ones).

The product of its digits is 72900, while the sum is 40.

The square root of 12399556 is about 3521.3003280038. The cubic root of 12399556 is about 231.4561428456.

The spelling of 12399556 in words is "twelve million, three hundred ninety-nine thousand, five hundred fifty-six".