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19891812134 = 212778314221
BaseRepresentation
bin10010100001101001…
…001111011100100110
31220100021221202101202
4102201221033130212
5311214300442014
613045502322502
71302636420245
oct224151173446
956307852352
1019891812134
118488455967
123a31889432
131b5015834c
14d69ba295c
157b64ea3de
hex4a1a4f726

19891812134 has 8 divisors (see below), whose sum is σ = 30072661248. Its totient is φ = 9867591720.

The previous prime is 19891812103. The next prime is 19891812137. The reversal of 19891812134 is 43121819891.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19891812137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39156857 + ... + 39157364.

It is an arithmetic number, because the mean of its divisors is an integer number (3759082656).

Almost surely, 219891812134 is an apocalyptic number.

19891812134 is a deficient number, since it is larger than the sum of its proper divisors (10180849114).

19891812134 is a wasteful number, since it uses less digits than its factorization.

19891812134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78314350.

The product of its digits is 124416, while the sum is 47.

The spelling of 19891812134 in words is "nineteen billion, eight hundred ninety-one million, eight hundred twelve thousand, one hundred thirty-four".

Divisors: 1 2 127 254 78314221 156628442 9945906067 19891812134