Search a number
-
+
12216647 = 41297967
BaseRepresentation
bin101110100110…
…100101000111
3211222200002102
4232212211013
511111413042
61113502315
7205561022
oct56464507
924880072
1012216647
116994603
12411199b
1326b97b1
1418a01b9
151114b32
hexba6947

12216647 has 4 divisors (see below), whose sum is σ = 12514656. Its totient is φ = 11918640.

The previous prime is 12216643. The next prime is 12216661. The reversal of 12216647 is 74661221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74661221 = 349213929.

It is a cyclic number.

It is not a de Polignac number, because 12216647 - 22 = 12216643 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12216643) 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 3 ways as a sum of consecutive naturals, for example, 148943 + ... + 149024.

It is an arithmetic number, because the mean of its divisors is an integer number (3128664).

Almost surely, 212216647 is an apocalyptic number.

12216647 is a deficient number, since it is larger than the sum of its proper divisors (298009).

12216647 is an equidigital number, since it uses as much as digits as its factorization.

12216647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298008.

The product of its digits is 4032, while the sum is 29.

The square root of 12216647 is about 3495.2320380770. The cubic root of 12216647 is about 230.3124109961.

Adding to 12216647 its reverse (74661221), we get a palindrome (86877868).

The spelling of 12216647 in words is "twelve million, two hundred sixteen thousand, six hundred forty-seven".

Divisors: 1 41 297967 12216647