12039987 has 4 divisors (see below), whose sum is σ = 16053320. Its totient is φ = 8026656.

The previous prime is 12039947. The next prime is 12039991. The reversal of 12039987 is 78993021.

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

It is not a de Polignac number, because 12039987 - 2¹⁰ = 12038963 is a prime.

It is a super-2 number, since 2×12039987² = 289922573920338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12039917) 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, 2006662 + ... + 2006667.

It is an arithmetic number, because the mean of its divisors is an integer number (4013330).

Almost surely, 2^12039987 is an apocalyptic number.

12039987 is a deficient number, since it is larger than the sum of its proper divisors (4013333).

12039987 is an equidigital number, since it uses as much as digits as its factorization.

12039987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4013332.

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

The square root of 12039987 is about 3469.8684413101. The cubic root of 12039987 is about 229.1968648396.

The spelling of 12039987 in words is "twelve million, thirty-nine thousand, nine hundred eighty-seven".