12001669 has 4 divisors (see below), whose sum is σ = 12008844. Its totient is φ = 11994496.

The previous prime is 12001667. The next prime is 12001697. The reversal of 12001669 is 96610021.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2772225 + 9229444 = 1665^2 + 3038^2 .

It is a cyclic number.

It is not a de Polignac number, because 12001669 - 2¹ = 12001667 is a prime.

It is a super-2 number, since 2×12001669² = 288080117571122, which contains 22 as substring.

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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 399 + ... + 4915.

It is an arithmetic number, because the mean of its divisors is an integer number (3002211).

Almost surely, 2^12001669 is an apocalyptic number.

It is an amenable number.

12001669 is a deficient number, since it is larger than the sum of its proper divisors (7175).

12001669 is an equidigital number, since it uses as much as digits as its factorization.

12001669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7174.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 12001669 is about 3464.3425061619. The cubic root of 12001669 is about 228.9534620635.

The spelling of 12001669 in words is "twelve million, one thousand, six hundred sixty-nine".