| Base | Representation |
|---|---|
| bin | 1001010111110… |
| … | …0100110100001 |
| 3 | 2201222001000001 |
| 4 | 2111330212201 |
| 5 | 40030321211 |
| 6 | 3522300001 |
| 7 | 655052440 |
| oct | 225744641 |
| 9 | 81861001 |
| 10 | 39307681 |
| 11 | 20208496 |
| 12 | 111b7601 |
| 13 | 81b36aa |
| 14 | 5312d57 |
| 15 | 36b6ac1 |
| hex | 257c9a1 |
39307681 has 4 divisors (see below), whose sum is σ = 44923072. Its totient is φ = 33692292.
The previous prime is 39307679. The next prime is 39307691. The reversal of 39307681 is 18670393.
39307681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18670393 = 7 ⋅2667199.
It is a cyclic number.
It is not a de Polignac number, because 39307681 - 21 = 39307679 is a prime.
It is a super-2 number, since 2×393076812 = 3090187571195522, 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 39307681.
It is not an unprimeable number, because it can be changed into a prime (39307661) 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 3 ways as a sum of consecutive naturals, for example, 2807685 + ... + 2807698.
It is an arithmetic number, because the mean of its divisors is an integer number (11230768).
Almost surely, 239307681 is an apocalyptic number.
It is an amenable number.
39307681 is a deficient number, since it is larger than the sum of its proper divisors (5615391).
39307681 is an equidigital number, since it uses as much as digits as its factorization.
39307681 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 5615390.
The product of its (nonzero) digits is 27216, while the sum is 37.
The square root of 39307681 is about 6269.5837979885. The cubic root of 39307681 is about 340.0106138555.
It can be divided in two parts, 3930 and 7681, that added together give a palindrome (11611).
The spelling of 39307681 in words is "thirty-nine million, three hundred seven thousand, six hundred eighty-one".
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