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18007 = 111637
BaseRepresentation
bin100011001010111
3220200221
410121113
51034012
6215211
7103333
oct43127
926627
1018007
1112590
12a507
138272
1467c3
155507
hex4657

18007 has 4 divisors (see below), whose sum is σ = 19656. Its totient is φ = 16360.

The previous prime is 17989. The next prime is 18013. The reversal of 18007 is 70081.

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

It is a cyclic number.

It is not a de Polignac number, because 18007 - 211 = 15959 is a prime.

It is a Duffinian number.

18007 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18047) 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, 808 + ... + 829.

It is an arithmetic number, because the mean of its divisors is an integer number (4914).

218007 is an apocalyptic number.

18007 is a deficient number, since it is larger than the sum of its proper divisors (1649).

18007 is a wasteful number, since it uses less digits than its factorization.

18007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1648.

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 18007 is about 134.1901635739. The cubic root of 18007 is about 26.2108107592.

Adding to 18007 its reverse (70081), we get a palindrome (88088).

It can be divided in two parts, 1 and 8007, that added together give a palindrome (8008).

The spelling of 18007 in words is "eighteen thousand, seven".

Divisors: 1 11 1637 18007