Base | Representation |
---|---|
bin | 11001010111110… |
… | …10110111101111 |
3 | 112211111101110222 |
4 | 30223322313233 |
5 | 413441334134 |
6 | 33041521555 |
7 | 5163052355 |
oct | 1453726757 |
9 | 484441428 |
10 | 212839919 |
11 | aa162866 |
12 | 5b3432bb |
13 | 351316a6 |
14 | 203a57d5 |
15 | 13a43a2e |
hex | cafadef |
212839919 has 16 divisors (see below), whose sum is σ = 228780000. Its totient is φ = 197406720.
The previous prime is 212839889. The next prime is 212839927. The reversal of 212839919 is 919938212.
It is a happy number.
It is a cyclic number.
It is not a de Polignac number, because 212839919 - 212 = 212835823 is a prime.
It is a super-2 number, since 2×2128399192 = 90601662239853122, which contains 22 as substring.
It is a Duffinian number.
It is a self number, because there is not a number n which added to its sum of digits gives 212839919.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (212839969) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 473807 + ... + 474255.
It is an arithmetic number, because the mean of its divisors is an integer number (14298750).
Almost surely, 2212839919 is an apocalyptic number.
212839919 is a deficient number, since it is larger than the sum of its proper divisors (15940081).
212839919 is a wasteful number, since it uses less digits than its factorization.
212839919 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 938.
The product of its digits is 69984, while the sum is 44.
The square root of 212839919 is about 14589.0342038121. The cubic root of 212839919 is about 597.0596128185.
The spelling of 212839919 in words is "two hundred twelve million, eight hundred thirty-nine thousand, nine hundred nineteen".
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