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18428872 = 2371129917
BaseRepresentation
bin100011001001…
…1001111001000
31021200021122211
41012103033020
514204210442
61454554504
7312433330
oct106231710
937607584
1018428872
11a447980
126208a34
133a83277
14263a0c0
151940617
hex11933c8

18428872 has 32 divisors (see below), whose sum is σ = 43081920. Its totient is φ = 7179840.

The previous prime is 18428869. The next prime is 18428873. The reversal of 18428872 is 27882481.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (18428873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14343 + ... + 15574.

It is an arithmetic number, because the mean of its divisors is an integer number (1346310).

Almost surely, 218428872 is an apocalyptic number.

It is an amenable number.

18428872 is an abundant number, since it is smaller than the sum of its proper divisors (24653048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18428872 is a wasteful number, since it uses less digits than its factorization.

18428872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29941 (or 29937 counting only the distinct ones).

The product of its digits is 57344, while the sum is 40.

The square root of 18428872 is about 4292.8862086014. The cubic root of 18428872 is about 264.1392363167.

The spelling of 18428872 in words is "eighteen million, four hundred twenty-eight thousand, eight hundred seventy-two".

Divisors: 1 2 4 7 8 11 14 22 28 44 56 77 88 154 308 616 29917 59834 119668 209419 239336 329087 418838 658174 837676 1316348 1675352 2303609 2632696 4607218 9214436 18428872