Search a number
-
+
12738561 = 311386017
BaseRepresentation
bin110000100110…
…000000000001
3212222012000120
4300212000001
511230113221
61133010453
7213163443
oct60460001
925865016
1012738561
117210740
124323a29
132840214
141998493
1511b95c6
hexc26001

12738561 has 8 divisors (see below), whose sum is σ = 18528864. Its totient is φ = 7720320.

The previous prime is 12738533. The next prime is 12738563. The reversal of 12738561 is 16583721.

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

It is not a de Polignac number, because 12738561 - 27 = 12738433 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 386017 = 12738561 / (1 + 2 + 7 + 3 + 8 + 5 + 6 + 1).

It is not an unprimeable number, because it can be changed into a prime (12738563) 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, 192976 + ... + 193041.

It is an arithmetic number, because the mean of its divisors is an integer number (2316108).

It is a Proth number, since it is equal to 1555 ⋅ 213 + 1 and 1555 < 213.

Almost surely, 212738561 is an apocalyptic number.

12738561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12738561 is a deficient number, since it is larger than the sum of its proper divisors (5790303).

12738561 is a wasteful number, since it uses less digits than its factorization.

12738561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386031.

The product of its digits is 10080, while the sum is 33.

The square root of 12738561 is about 3569.1120744521. The cubic root of 12738561 is about 233.5465504569.

The spelling of 12738561 in words is "twelve million, seven hundred thirty-eight thousand, five hundred sixty-one".

Divisors: 1 3 11 33 386017 1158051 4246187 12738561