12001687 has 4 divisors (see below), whose sum is σ = 12280840. Its totient is φ = 11722536.

The previous prime is 12001667. The next prime is 12001697. The reversal of 12001687 is 78610021.

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

It is a cyclic number.

It is not a de Polignac number, because 12001687 - 2¹⁹ = 11477399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139512 + ... + 139597.

It is an arithmetic number, because the mean of its divisors is an integer number (3070210).

Almost surely, 2^12001687 is an apocalyptic number.

12001687 is a deficient number, since it is larger than the sum of its proper divisors (279153).

12001687 is an equidigital number, since it uses as much as digits as its factorization.

12001687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279152.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 12001687 is about 3464.3451040565. The cubic root of 12001687 is about 228.9535765242.

The spelling of 12001687 in words is "twelve million, one thousand, six hundred eighty-seven".