12639069 has 12 divisors (see below), whose sum is σ = 18601596. Its totient is φ = 8266752.

The previous prime is 12639031. The next prime is 12639071. The reversal of 12639069 is 96093621.

12639069 is a `hidden beast` number, since 12 + 639 + 0 + 6 + 9 = 666.

12639069 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 10478169 + 2160900 = 3237^2 + 1470^2 .

It is not a de Polignac number, because 12639069 - 2¹⁵ = 12606301 is a prime.

It is a super-2 number, since 2×12639069² = 319492130373522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12639019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12772 + ... + 13725.

It is an arithmetic number, because the mean of its divisors is an integer number (1550133).

Almost surely, 2^12639069 is an apocalyptic number.

It is an amenable number.

12639069 is a deficient number, since it is larger than the sum of its proper divisors (5962527).

12639069 is a wasteful number, since it uses less digits than its factorization.

12639069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26556 (or 26553 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 12639069 is about 3555.1468324107. The cubic root of 12639069 is about 232.9369376266.

The spelling of 12639069 in words is "twelve million, six hundred thirty-nine thousand, sixty-nine".