12487987 has 4 divisors (see below), whose sum is σ = 12509640. Its totient is φ = 12466336.

The previous prime is 12487973. The next prime is 12488023. The reversal of 12487987 is 78978421.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12487987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12487927) 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, 9937 + ... + 11122.

It is an arithmetic number, because the mean of its divisors is an integer number (3127410).

Almost surely, 2^12487987 is an apocalyptic number.

12487987 is a deficient number, since it is larger than the sum of its proper divisors (21653).

12487987 is an equidigital number, since it uses as much as digits as its factorization.

12487987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21652.

The product of its digits is 225792, while the sum is 46.

The square root of 12487987 is about 3533.8346028076. The cubic root of 12487987 is about 232.0050719759.

The spelling of 12487987 in words is "twelve million, four hundred eighty-seven thousand, nine hundred eighty-seven".