Search a number
-
+
18958 = 29479
BaseRepresentation
bin100101000001110
3222000011
410220032
51101313
6223434
7106162
oct45016
928004
1018958
1113275
12ab7a
138824
146ca2
15593d
hex4a0e

18958 has 4 divisors (see below), whose sum is σ = 28440. Its totient is φ = 9478.

The previous prime is 18947. The next prime is 18959. The reversal of 18958 is 85981.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4738 + ... + 4741.

It is an arithmetic number, because the mean of its divisors is an integer number (7110).

218958 is an apocalyptic number.

18958 is a deficient number, since it is larger than the sum of its proper divisors (9482).

18958 is an equidigital number, since it uses as much as digits as its factorization.

18958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9481.

The product of its digits is 2880, while the sum is 31.

The square root of 18958 is about 137.6880532218. The cubic root of 18958 is about 26.6643400748.

The spelling of 18958 in words is "eighteen thousand, nine hundred fifty-eight".

Divisors: 1 2 9479 18958