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18925 = 52757
BaseRepresentation
bin100100111101101
3221221221
410213231
51101200
6223341
7106114
oct44755
927857
1018925
1113245
12ab51
1387ca
146c7b
15591a
hex49ed

18925 has 6 divisors (see below), whose sum is σ = 23498. Its totient is φ = 15120.

The previous prime is 18919. The next prime is 18947. The reversal of 18925 is 52981.

It can be written as a sum of positive squares in 3 ways, for example, as 1764 + 17161 = 42^2 + 131^2 .

It is not a de Polignac number, because 18925 - 23 = 18917 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 757 = 18925 / (1 + 8 + 9 + 2 + 5).

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18925.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 354 + ... + 403.

218925 is an apocalyptic number.

It is an amenable number.

18925 is a deficient number, since it is larger than the sum of its proper divisors (4573).

18925 is an equidigital number, since it uses as much as digits as its factorization.

18925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 767 (or 762 counting only the distinct ones).

The product of its digits is 720, while the sum is 25.

The square root of 18925 is about 137.5681649220. The cubic root of 18925 is about 26.6488596395.

18925 divided by its sum of digits (25) gives a palindrome (757).

The spelling of 18925 in words is "eighteen thousand, nine hundred twenty-five".

Divisors: 1 5 25 757 3785 18925