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18115349 = 721732137
BaseRepresentation
bin100010100011…
…0101100010101
31021002100120212
41011012230111
514114142344
61444135205
7306656300
oct105065425
937070525
1018115349
11a25336a
126097505
1339a3655
142597b37
1518cc79e
hex1146b15

18115349 has 12 divisors (see below), whose sum is σ = 21204684. Its totient is φ = 15430464.

The previous prime is 18115313. The next prime is 18115367. The reversal of 18115349 is 94351181.

It can be written as a sum of positive squares in 2 ways, for example, as 8236900 + 9878449 = 2870^2 + 3143^2 .

It is not a de Polignac number, because 18115349 - 28 = 18115093 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18115309) 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 11 ways as a sum of consecutive naturals, for example, 7409 + ... + 9545.

It is an arithmetic number, because the mean of its divisors is an integer number (1767057).

Almost surely, 218115349 is an apocalyptic number.

It is an amenable number.

18115349 is a deficient number, since it is larger than the sum of its proper divisors (3089335).

18115349 is a wasteful number, since it uses less digits than its factorization.

18115349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2324 (or 2317 counting only the distinct ones).

The product of its digits is 4320, while the sum is 32.

The square root of 18115349 is about 4256.2129880916. The cubic root of 18115349 is about 262.6327624721.

The spelling of 18115349 in words is "eighteen million, one hundred fifteen thousand, three hundred forty-nine".

Divisors: 1 7 49 173 1211 2137 8477 14959 104713 369701 2587907 18115349