12639001 has 4 divisors (see below), whose sum is σ = 12812212. Its totient is φ = 12465792.

The previous prime is 12638993. The next prime is 12639019. The reversal of 12639001 is 10093621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10896601 + 1742400 = 3301^2 + 1320^2 .

It is a cyclic number.

It is not a de Polignac number, because 12639001 - 2³ = 12638993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12639031) 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, 86496 + ... + 86641.

It is an arithmetic number, because the mean of its divisors is an integer number (3203053).

Almost surely, 2^12639001 is an apocalyptic number.

It is an amenable number.

12639001 is a deficient number, since it is larger than the sum of its proper divisors (173211).

12639001 is an equidigital number, since it uses as much as digits as its factorization.

12639001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173210.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 12639001 is about 3555.1372687985. The cubic root of 12639001 is about 232.9365198811.

The spelling of 12639001 in words is "twelve million, six hundred thirty-nine thousand, one".