12169987 has 4 divisors (see below), whose sum is σ = 12277800. Its totient is φ = 12062176.

The previous prime is 12169973. The next prime is 12169991. The reversal of 12169987 is 78996121.

12169987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78996121 = 97 ⋅814393.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12169987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12169957) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53737 + ... + 53962.

It is an arithmetic number, because the mean of its divisors is an integer number (3069450).

Almost surely, 2^12169987 is an apocalyptic number.

12169987 is a deficient number, since it is larger than the sum of its proper divisors (107813).

12169987 is a wasteful number, since it uses less digits than its factorization.

12169987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107812.

The product of its digits is 54432, while the sum is 43.

The square root of 12169987 is about 3488.5508452651. The cubic root of 12169987 is about 230.0188201361.

The spelling of 12169987 in words is "twelve million, one hundred sixty-nine thousand, nine hundred eighty-seven".