12640001 has 8 divisors (see below), whose sum is σ = 13820544. Its totient is φ = 11464720.

The previous prime is 12639989. The next prime is 12640003. The reversal of 12640001 is 10004621.

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 12640001 - 2¹⁸ = 12377857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12640003) 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, 5096 + ... + 7158.

It is an arithmetic number, because the mean of its divisors is an integer number (1727568).

Almost surely, 2^12640001 is an apocalyptic number.

12640001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12640001 is a deficient number, since it is larger than the sum of its proper divisors (1180543).

12640001 is a wasteful number, since it uses less digits than its factorization.

12640001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2631.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 12640001 is about 3555.2779075622. The cubic root of 12640001 is about 232.9426630454.

Adding to 12640001 its reverse (10004621), we get a palindrome (22644622).

The spelling of 12640001 in words is "twelve million, six hundred forty thousand, one".