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18097971 = 37184967
BaseRepresentation
bin100010100001…
…0011100110011
31021001110202020
41011002130303
514113113341
61443522523
7306554523
oct105023463
937043666
1018097971
11a241301
126089443
133998778
142591683
1518c7566
hex1142733

18097971 has 8 divisors (see below), whose sum is σ = 24470784. Its totient is φ = 11895240.

The previous prime is 18097931. The next prime is 18097991. The reversal of 18097971 is 17979081.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18097971 - 217 = 17966899 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18097931) 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 7 ways as a sum of consecutive naturals, for example, 42271 + ... + 42696.

It is an arithmetic number, because the mean of its divisors is an integer number (3058848).

Almost surely, 218097971 is an apocalyptic number.

18097971 is a deficient number, since it is larger than the sum of its proper divisors (6372813).

18097971 is an equidigital number, since it uses as much as digits as its factorization.

18097971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85041.

The product of its (nonzero) digits is 31752, while the sum is 42.

The square root of 18097971 is about 4254.1710120774. The cubic root of 18097971 is about 262.5487546630.

The spelling of 18097971 in words is "eighteen million, ninety-seven thousand, nine hundred seventy-one".

Divisors: 1 3 71 213 84967 254901 6032657 18097971