12309987 has 4 divisors (see below), whose sum is σ = 16413320. Its totient is φ = 8206656.

The previous prime is 12309961. The next prime is 12310013. The reversal of 12309987 is 78990321.

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

It is an interprime number because it is at equal distance from previous prime (12309961) and next prime (12310013).

It is not a de Polignac number, because 12309987 - 2¹⁵ = 12277219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12309907) 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, 2051662 + ... + 2051667.

It is an arithmetic number, because the mean of its divisors is an integer number (4103330).

Almost surely, 2^12309987 is an apocalyptic number.

12309987 is a deficient number, since it is larger than the sum of its proper divisors (4103333).

12309987 is an equidigital number, since it uses as much as digits as its factorization.

12309987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4103332.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 12309987 is about 3508.5591059579. The cubic root of 12309987 is about 230.8974826670.

The spelling of 12309987 in words is "twelve million, three hundred nine thousand, nine hundred eighty-seven".