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18718946 = 217354101
BaseRepresentation
bin100011101101…
…0000011100010
31022020000120022
41013122003202
514243001241
61505113442
7315052121
oct107320342
938200508
1018718946
11a625904
126328882
133b552cc
1426b3ab8
15199b54b
hex11da0e2

18718946 has 8 divisors (see below), whose sum is σ = 28241244. Its totient is φ = 9305200.

The previous prime is 18718943. The next prime is 18718951. The reversal of 18718946 is 64981781.

It can be written as a sum of positive squares in 2 ways, for example, as 15960025 + 2758921 = 3995^2 + 1661^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 18718897 and 18718906.

It is not an unprimeable number, because it can be changed into a prime (18718943) 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, 26705 + ... + 27396.

Almost surely, 218718946 is an apocalyptic number.

18718946 is a deficient number, since it is larger than the sum of its proper divisors (9522298).

18718946 is a wasteful number, since it uses less digits than its factorization.

18718946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54276.

The product of its digits is 96768, while the sum is 44.

The square root of 18718946 is about 4326.5397259242. The cubic root of 18718946 is about 265.5178954769.

The spelling of 18718946 in words is "eighteen million, seven hundred eighteen thousand, nine hundred forty-six".

Divisors: 1 2 173 346 54101 108202 9359473 18718946