12660401 has 8 divisors (see below), whose sum is σ = 14003304. Its totient is φ = 11370240.

The previous prime is 12660377. The next prime is 12660409. The reversal of 12660401 is 10406621.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5180176 + 7480225 = 2276^2 + 2735^2 .

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 12660401 - 2⁶ = 12660337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12660409) 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 7 ways as a sum of consecutive naturals, for example, 12680 + ... + 13641.

It is an arithmetic number, because the mean of its divisors is an integer number (1750413).

Almost surely, 2^12660401 is an apocalyptic number.

It is an amenable number.

12660401 is a deficient number, since it is larger than the sum of its proper divisors (1342903).

12660401 is a wasteful number, since it uses less digits than its factorization.

12660401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26371.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 12660401 is about 3558.1457249528. The cubic root of 12660401 is about 233.0679129338.

The spelling of 12660401 in words is "twelve million, six hundred sixty thousand, four hundred one".