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19718041 = 7357487
BaseRepresentation
bin100101100110…
…1111110011001
31101002210001211
41023031332121
520021434131
61542343121
7326413000
oct113157631
941083054
1019718041
1110148502
12672aaa1
134114ca5
142893c37
151ae75b1
hex12cdf99

19718041 has 8 divisors (see below), whose sum is σ = 22995200. Its totient is φ = 16900884.

The previous prime is 19718009. The next prime is 19718047. The reversal of 19718041 is 14081791.

It is not a de Polignac number, because 19718041 - 25 = 19718009 is a prime.

It is a super-2 number, since 2×197180412 = 777602281755362, which contains 22 as substring.

It is the 4441-st Hogben number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19717994 and 19718012.

It is not an unprimeable number, because it can be changed into a prime (19718047) by changing a digit.

It is a nontrivial repunit in base 4440.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28401 + ... + 29086.

It is an arithmetic number, because the mean of its divisors is an integer number (2874400).

Almost surely, 219718041 is an apocalyptic number.

It is an amenable number.

19718041 is a deficient number, since it is larger than the sum of its proper divisors (3277159).

19718041 is an frugal number, since it uses more digits than its factorization.

19718041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57508 (or 57494 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 31.

The square root of 19718041 is about 4440.5000844499. The cubic root of 19718041 is about 270.1601290646.

The spelling of 19718041 in words is "nineteen million, seven hundred eighteen thousand, forty-one".

Divisors: 1 7 49 343 57487 402409 2816863 19718041