12387987 has 6 divisors (see below), whose sum is σ = 17893772. Its totient is φ = 8258652.

The previous prime is 12387979. The next prime is 12388031. The reversal of 12387987 is 78978321.

12387987 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12387987 - 2³ = 12387979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12387937) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 688213 + ... + 688230.

Almost surely, 2^12387987 is an apocalyptic number.

12387987 is a deficient number, since it is larger than the sum of its proper divisors (5505785).

12387987 is a wasteful number, since it uses less digits than its factorization.

12387987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376449 (or 1376446 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 12387987 is about 3519.6572276288. The cubic root of 12387987 is about 231.3841362529.

The spelling of 12387987 in words is "twelve million, three hundred eighty-seven thousand, nine hundred eighty-seven".