12989556 has 18 divisors (see below), whose sum is σ = 32834802. Its totient is φ = 4329840.

The previous prime is 12989539. The next prime is 12989563. The reversal of 12989556 is 65598921.

12989556 is a `hidden beast` number, since 1 + 2 + 98 + 9 + 556 = 666.

It can be written as a sum of positive squares in only one way, i.e., 6937956 + 6051600 = 2634^2 + 2460^2 .

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

It is a congruent number.

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 in 5 ways as a sum of consecutive naturals, for example, 180375 + ... + 180446.

Almost surely, 2^12989556 is an apocalyptic number.

It is an amenable number.

12989556 is an abundant number, since it is smaller than the sum of its proper divisors (19845246).

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

12989556 is a wasteful number, since it uses less digits than its factorization.

12989556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360831 (or 360826 counting only the distinct ones).

The product of its digits is 194400, while the sum is 45.

The square root of 12989556 is about 3604.1026622448. The cubic root of 12989556 is about 235.0704843650.

The spelling of 12989556 in words is "twelve million, nine hundred eighty-nine thousand, five hundred fifty-six".