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18428 = 2217271
BaseRepresentation
bin100011111111100
3221021112
410133330
51042203
6221152
7104504
oct43774
927245
1018428
1112933
12a7b8
138507
146a04
1556d8
hex47fc

18428 has 12 divisors (see below), whose sum is σ = 34272. Its totient is φ = 8640.

The previous prime is 18427. The next prime is 18433. The reversal of 18428 is 82481.

It can be divided in two parts, 184 and 28, that added together give a palindrome (212).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68 + ... + 203.

It is an arithmetic number, because the mean of its divisors is an integer number (2856).

218428 is an apocalyptic number.

It is an amenable number.

18428 is a deficient number, since it is larger than the sum of its proper divisors (15844).

18428 is a wasteful number, since it uses less digits than its factorization.

18428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292 (or 290 counting only the distinct ones).

The product of its digits is 512, while the sum is 23.

The square root of 18428 is about 135.7497697972. The cubic root of 18428 is about 26.4135070154.

The spelling of 18428 in words is "eighteen thousand, four hundred twenty-eight".

Divisors: 1 2 4 17 34 68 271 542 1084 4607 9214 18428