12003645 has 8 divisors (see below), whose sum is σ = 19205856. Its totient is φ = 6401936.

The previous prime is 12003619. The next prime is 12003647. The reversal of 12003645 is 54630021.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12003645 - 2⁵ = 12003613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12003647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 400107 + ... + 400136.

It is an arithmetic number, because the mean of its divisors is an integer number (2400732).

Almost surely, 2^12003645 is an apocalyptic number.

12003645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12003645 is a deficient number, since it is larger than the sum of its proper divisors (7202211).

12003645 is an equidigital number, since it uses as much as digits as its factorization.

12003645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800251.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 12003645 is about 3464.6276856251. The cubic root of 12003645 is about 228.9660266275.

Adding to 12003645 its reverse (54630021), we get a palindrome (66633666).

The spelling of 12003645 in words is "twelve million, three thousand, six hundred forty-five".