12381687 has 16 divisors (see below), whose sum is σ = 18400000. Its totient is φ = 8228952.

The previous prime is 12381641. The next prime is 12381689. The reversal of 12381687 is 78618321.

It is not a de Polignac number, because 12381687 - 2¹⁰ = 12380663 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12381689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13014 + ... + 13932.

It is an arithmetic number, because the mean of its divisors is an integer number (1150000).

Almost surely, 2^12381687 is an apocalyptic number.

12381687 is a deficient number, since it is larger than the sum of its proper divisors (6018313).

12381687 is an equidigital number, since it uses as much as digits as its factorization.

12381687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1427 (or 1421 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 12381687 is about 3518.7621402988. The cubic root of 12381687 is about 231.3449055789.

It can be divided in two parts, 123 and 81687, that added together give a triangular number (81810 = T₄₀₄).

The spelling of 12381687 in words is "twelve million, three hundred eighty-one thousand, six hundred eighty-seven".