12009987 has 12 divisors (see below), whose sum is σ = 18924984. Its totient is φ = 7278720.

The previous prime is 12009971. The next prime is 12009997. The reversal of 12009987 is 78990021.

It is a happy number.

It is not a de Polignac number, because 12009987 - 2⁴ = 12009971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12009917) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60558 + ... + 60755.

It is an arithmetic number, because the mean of its divisors is an integer number (1577082).

Almost surely, 2^12009987 is an apocalyptic number.

12009987 is a deficient number, since it is larger than the sum of its proper divisors (6914997).

12009987 is a wasteful number, since it uses less digits than its factorization.

12009987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121330 (or 121327 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 12009987 is about 3465.5428146251. The cubic root of 12009987 is about 229.0063434613.

It can be divided in two parts, 12009 and 987, that added together give a square (12996 = 114²).

The spelling of 12009987 in words is "twelve million, nine thousand, nine hundred eighty-seven".