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12642689 = 97130337
BaseRepresentation
bin110000001110…
…100110000001
3212210022111202
4300032212001
511214031224
61130550545
7212314103
oct60164601
925708452
1012642689
117155704
124298455
1328086a7
141971573
15119aeae
hexc0e981

12642689 has 4 divisors (see below), whose sum is σ = 12773124. Its totient is φ = 12512256.

The previous prime is 12642659. The next prime is 12642691. The reversal of 12642689 is 98624621.

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 10452289 + 2190400 = 3233^2 + 1480^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-12642689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12642649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65072 + ... + 65265.

It is an arithmetic number, because the mean of its divisors is an integer number (3193281).

Almost surely, 212642689 is an apocalyptic number.

It is an amenable number.

12642689 is a deficient number, since it is larger than the sum of its proper divisors (130435).

12642689 is an equidigital number, since it uses as much as digits as its factorization.

12642689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130434.

The product of its digits is 41472, while the sum is 38.

The square root of 12642689 is about 3555.6559169863. The cubic root of 12642689 is about 232.9591742650.

It can be divided in two parts, 12642 and 689, that added together give a palindrome (13331).

The spelling of 12642689 in words is "twelve million, six hundred forty-two thousand, six hundred eighty-nine".

Divisors: 1 97 130337 12642689