12001689 has 40 divisors (see below), whose sum is σ = 20885568. Its totient is φ = 6726240.

The previous prime is 12001667. The next prime is 12001697. The reversal of 12001689 is 98610021.

12001689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12001689 - 2⁹ = 12001177 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12001189) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 34414 + ... + 34760.

Almost surely, 2^12001689 is an apocalyptic number.

It is an amenable number.

12001689 is a deficient number, since it is larger than the sum of its proper divisors (8883879).

12001689 is an equidigital number, since it uses as much as digits as its factorization.

12001689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427 (or 418 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 12001689 is about 3464.3453927113. The cubic root of 12001689 is about 228.9535892421.

The spelling of 12001689 in words is "twelve million, one thousand, six hundred eighty-nine".