12170987 has 4 divisors (see below), whose sum is σ = 12187056. Its totient is φ = 12154920.

The previous prime is 12170971. The next prime is 12170989. The reversal of 12170987 is 78907121.

12170987 is digitally balanced in base 3, 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.

It is a cyclic number.

It is not a de Polignac number, because 12170987 - 2⁴ = 12170971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12170989) 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, 6839 + ... + 8432.

It is an arithmetic number, because the mean of its divisors is an integer number (3046764).

Almost surely, 2^12170987 is an apocalyptic number.

12170987 is a deficient number, since it is larger than the sum of its proper divisors (16069).

12170987 is an equidigital number, since it uses as much as digits as its factorization.

12170987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16068.

The product of its (nonzero) digits is 7056, while the sum is 35.

The square root of 12170987 is about 3488.6941683100. The cubic root of 12170987 is about 230.0251201297.

The spelling of 12170987 in words is "twelve million, one hundred seventy thousand, nine hundred eighty-seven".