12639009 has 8 divisors (see below), whose sum is σ = 17739040. Its totient is φ = 7982496.

The previous prime is 12638993. The next prime is 12639019. The reversal of 12639009 is 90093621.

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

It is not a de Polignac number, because 12639009 - 2⁴ = 12638993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12639019) 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, 110812 + ... + 110925.

It is an arithmetic number, because the mean of its divisors is an integer number (2217380).

Almost surely, 2^12639009 is an apocalyptic number.

12639009 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

12639009 is a deficient number, since it is larger than the sum of its proper divisors (5100031).

12639009 is a wasteful number, since it uses less digits than its factorization.

12639009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221759.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 12639009 is about 3555.1383939307. The cubic root of 12639009 is about 232.9365690277.

The spelling of 12639009 in words is "twelve million, six hundred thirty-nine thousand, nine".