Base | Representation |
---|---|
bin | 1001011101011… |
… | …1110000010000 |
3 | 2202200000011011 |
4 | 2113113300100 |
5 | 40124243130 |
6 | 3534300304 |
7 | 661166110 |
oct | 227276020 |
9 | 82600134 |
10 | 39681040 |
11 | 20442a53 |
12 | 11357694 |
13 | 82b4609 |
14 | 53ad040 |
15 | 373c52a |
hex | 25d7c10 |
39681040 has 80 divisors (see below), whose sum is σ = 107314560. Its totient is φ = 13363200.
The previous prime is 39681017. The next prime is 39681041. The reversal of 39681040 is 4018693.
39681040 = 5622 + 5632 + ... + 6662.
It is a tau number, because it is divible by the number of its divisors (80).
It is a junction number, because it is equal to n+sod(n) for n = 39680993 and 39681011.
It is not an unprimeable number, because it can be changed into a prime (39681041) 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, 32440 + ... + 33640.
It is an arithmetic number, because the mean of its divisors is an integer number (1341432).
It is a vampire number, since it can be written as 4130 ⋅ 9608 (with its own digits).
Almost surely, 239681040 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 39681040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53657280).
39681040 is an abundant number, since it is smaller than the sum of its proper divisors (67633520).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
39681040 is a wasteful number, since it uses less digits than its factorization.
39681040 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1280 (or 1274 counting only the distinct ones).
The product of its (nonzero) digits is 5184, while the sum is 31.
The square root of 39681040 is about 6299.2888487511. The cubic root of 39681040 is about 341.0837391775.
The spelling of 39681040 in words is "thirty-nine million, six hundred eighty-one thousand, forty".
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