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19965309 = 371373133
BaseRepresentation
bin100110000101…
…0010101111101
31101120100020220
41030022111331
520102342214
61551531553
7331462620
oct114122575
941510226
1019965309
11102a7261
126829bb9
1341a06c0
142919db7
151b459a9
hex130a57d

19965309 has 16 divisors (see below), whose sum is σ = 32764032. Its totient is φ = 10531008.

The previous prime is 19965307. The next prime is 19965347. The reversal of 19965309 is 90356991.

It is not a de Polignac number, because 19965309 - 21 = 19965307 is a prime.

It is a super-2 number, since 2×199653092 = 797227126930962, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19965301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36294 + ... + 36839.

It is an arithmetic number, because the mean of its divisors is an integer number (2047752).

Almost surely, 219965309 is an apocalyptic number.

It is an amenable number.

19965309 is a deficient number, since it is larger than the sum of its proper divisors (12798723).

19965309 is a wasteful number, since it uses less digits than its factorization.

19965309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73156.

The product of its (nonzero) digits is 65610, while the sum is 42.

The square root of 19965309 is about 4468.2556999348. The cubic root of 19965309 is about 271.2847277275.

The spelling of 19965309 in words is "nineteen million, nine hundred sixty-five thousand, three hundred nine".

Divisors: 1 3 7 13 21 39 91 273 73133 219399 511931 950729 1535793 2852187 6655103 19965309