12305556 has 18 divisors (see below), whose sum is σ = 31105802. Its totient is φ = 4101840.

The previous prime is 12305551. The next prime is 12305561. The reversal of 12305556 is 65550321.

12305556 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12305551) and next prime (12305561).

It can be written as a sum of positive squares in only one way, i.e., 8503056 + 3802500 = 2916^2 + 1950^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12305551) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 170875 + ... + 170946.

Almost surely, 2^12305556 is an apocalyptic number.

It is an amenable number.

12305556 is an abundant number, since it is smaller than the sum of its proper divisors (18800246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12305556 is a wasteful number, since it uses less digits than its factorization.

12305556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341831 (or 341826 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 12305556 is about 3507.9275933234. The cubic root of 12305556 is about 230.8697753665.

Adding to 12305556 its reverse (65550321), we get a palindrome (77855877).

It can be divided in two parts, 1230 and 5556, that added together give a triangular number (6786 = T₁₁₆).

The spelling of 12305556 in words is "twelve million, three hundred five thousand, five hundred fifty-six".