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18140216 = 2371109293
BaseRepresentation
bin100010100110…
…0110000111000
31021010121200212
41011030300320
514120441331
61444450252
7310121633
oct105146070
937117625
1018140216
11a270016
1260a9988
1339b1a73
1425a2c1a
1518d4d2b
hex114cc38

18140216 has 32 divisors (see below), whose sum is σ = 34927200. Its totient is φ = 8830080.

The previous prime is 18140203. The next prime is 18140219. The reversal of 18140216 is 61204181.

Adding to 18140216 its reverse (61204181), we get a palindrome (79344397).

It is a junction number, because it is equal to n+sod(n) for n = 18140191 and 18140200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18140219) 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, 61766 + ... + 62058.

It is an arithmetic number, because the mean of its divisors is an integer number (1091475).

Almost surely, 218140216 is an apocalyptic number.

It is an amenable number.

18140216 is a deficient number, since it is larger than the sum of its proper divisors (16786984).

18140216 is a wasteful number, since it uses less digits than its factorization.

18140216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479 (or 475 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 18140216 is about 4259.1332451568. The cubic root of 18140216 is about 262.7528798168.

The spelling of 18140216 in words is "eighteen million, one hundred forty thousand, two hundred sixteen".

Divisors: 1 2 4 8 71 109 142 218 284 293 436 568 586 872 1172 2344 7739 15478 20803 30956 31937 41606 61912 63874 83212 127748 166424 255496 2267527 4535054 9070108 18140216