12381987 has 8 divisors (see below), whose sum is σ = 16538704. Its totient is φ = 8239968.

The previous prime is 12381983. The next prime is 12381991. The reversal of 12381987 is 78918321.

It is an interprime number because it is at equal distance from previous prime (12381983) and next prime (12381991).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12381987 - 2² = 12381983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12381983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1528 + ... + 5205.

It is an arithmetic number, because the mean of its divisors is an integer number (2067338).

Almost surely, 2^12381987 is an apocalyptic number.

12381987 is a deficient number, since it is larger than the sum of its proper divisors (4156717).

12381987 is an equidigital number, since it uses as much as digits as its factorization.

12381987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7349.

The product of its digits is 24192, while the sum is 39.

The square root of 12381987 is about 3518.8047686679. The cubic root of 12381987 is about 231.3467740080.

The spelling of 12381987 in words is "twelve million, three hundred eighty-one thousand, nine hundred eighty-seven".