12639895 has 8 divisors (see below), whose sum is σ = 15186960. Its totient is φ = 10099200.

The previous prime is 12639889. The next prime is 12639901. The reversal of 12639895 is 59893621.

It is a happy number.

12639895 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12639889) and next prime (12639901).

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

It is not a de Polignac number, because 12639895 - 2¹¹ = 12637847 is a prime.

It is a super-2 number, since 2×12639895² = 319533891222050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 7095 + ... + 8695.

It is an arithmetic number, because the mean of its divisors is an integer number (1898370).

Almost surely, 2^12639895 is an apocalyptic number.

12639895 is a deficient number, since it is larger than the sum of its proper divisors (2547065).

12639895 is a wasteful number, since it uses less digits than its factorization.

12639895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3185.

The product of its digits is 116640, while the sum is 43.

The square root of 12639895 is about 3555.2630001169. The cubic root of 12639895 is about 232.9420118853.

The spelling of 12639895 in words is "twelve million, six hundred thirty-nine thousand, eight hundred ninety-five".