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18140517 = 34281797
BaseRepresentation
bin100010100110…
…0110101100101
31021010122010000
41011030311211
514120444032
61444451513
7310122543
oct105146545
937118100
1018140517
11a27026a
1260a9b99
1339b1c45
1425a2d93
1518d4e7c
hex114cd65

18140517 has 20 divisors (see below), whose sum is σ = 27229356. Its totient is φ = 12035520.

The previous prime is 18140503. The next prime is 18140519. The reversal of 18140517 is 71504181.

18140517 is a `hidden beast` number, since 1 + 8 + 140 + 517 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 10556001 + 7584516 = 3249^2 + 2754^2 .

It is not a de Polignac number, because 18140517 - 24 = 18140501 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18140519) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 22363 + ... + 23159.

Almost surely, 218140517 is an apocalyptic number.

It is an amenable number.

18140517 is a deficient number, since it is larger than the sum of its proper divisors (9088839).

18140517 is an equidigital number, since it uses as much as digits as its factorization.

18140517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090 (or 1081 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 18140517 is about 4259.1685808383. The cubic root of 18140517 is about 262.7543330920.

Adding to 18140517 its reverse (71504181), we get a palindrome (89644698).

The spelling of 18140517 in words is "eighteen million, one hundred forty thousand, five hundred seventeen".

Divisors: 1 3 9 27 81 281 797 843 2391 2529 7173 7587 21519 22761 64557 223957 671871 2015613 6046839 18140517