12003681 has 4 divisors (see below), whose sum is σ = 16004912. Its totient is φ = 8002452.

The previous prime is 12003679. The next prime is 12003689. The reversal of 12003681 is 18630021.

12003681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12003681 - 2¹ = 12003679 is a prime.

It is a super-2 number, since 2×12003681² = 288176715099522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12003689) 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, 2000611 + ... + 2000616.

It is an arithmetic number, because the mean of its divisors is an integer number (4001228).

Almost surely, 2^12003681 is an apocalyptic number.

It is an amenable number.

12003681 is a deficient number, since it is larger than the sum of its proper divisors (4001231).

12003681 is an equidigital number, since it uses as much as digits as its factorization.

12003681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4001230.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 12003681 is about 3464.6328809847. The cubic root of 12003681 is about 228.9662555237.

The spelling of 12003681 in words is "twelve million, three thousand, six hundred eighty-one".