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12639 = 311383
BaseRepresentation
bin11000101011111
3122100010
43011133
5401024
6134303
751564
oct30537
918303
1012639
119550
127393
1359a3
14486b
153b29
hex315f

12639 has 8 divisors (see below), whose sum is σ = 18432. Its totient is φ = 7640.

The previous prime is 12637. The next prime is 12641. The reversal of 12639 is 93621.

It is an interprime number because it is at equal distance from previous prime (12637) and next prime (12641).

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 12639 - 21 = 12637 is a prime.

It is an Ulam number.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12637) 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, 159 + ... + 224.

It is an arithmetic number, because the mean of its divisors is an integer number (2304).

212639 is an apocalyptic number.

12639 is a deficient number, since it is larger than the sum of its proper divisors (5793).

12639 is a wasteful number, since it uses less digits than its factorization.

12639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397.

The product of its digits is 324, while the sum is 21.

The square root of 12639 is about 112.4233071921. The cubic root of 12639 is about 23.2936513738.

The spelling of 12639 in words is "twelve thousand, six hundred thirty-nine".

Divisors: 1 3 11 33 383 1149 4213 12639