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18489803 = 127145589
BaseRepresentation
bin100011010001…
…0000111001011
31021210101020112
41012202013023
514213133203
61500144535
7313106063
oct106420713
937711215
1018489803
11a489732
12623814b
133aa4c17
1426543a3
1519536d8
hex11a21cb

18489803 has 4 divisors (see below), whose sum is σ = 18635520. Its totient is φ = 18344088.

The previous prime is 18489781. The next prime is 18489817. The reversal of 18489803 is 30898481.

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 18489803 - 210 = 18488779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18489203) 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 3 ways as a sum of consecutive naturals, for example, 72668 + ... + 72921.

It is an arithmetic number, because the mean of its divisors is an integer number (4658880).

Almost surely, 218489803 is an apocalyptic number.

18489803 is a deficient number, since it is larger than the sum of its proper divisors (145717).

18489803 is a wasteful number, since it uses less digits than its factorization.

18489803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145716.

The product of its (nonzero) digits is 55296, while the sum is 41.

The square root of 18489803 is about 4299.9770929622. The cubic root of 18489803 is about 264.4300221180.

The spelling of 18489803 in words is "eighteen million, four hundred eighty-nine thousand, eight hundred three".

Divisors: 1 127 145589 18489803