Base | Representation |
---|---|
bin | 110001000110… |
… | …010101001001 |
3 | 220012220200011 |
4 | 301012111021 |
5 | 11243332420 |
6 | 1135511521 |
7 | 214254511 |
oct | 61062511 |
9 | 26186604 |
10 | 12870985 |
11 | 72a1186 |
12 | 43885a1 |
13 | 288858a |
14 | 19d0841 |
15 | 11e395a |
hex | c46549 |
12870985 has 8 divisors (see below), whose sum is σ = 15465096. Its totient is φ = 10283520.
The previous prime is 12870973. The next prime is 12871009. The reversal of 12870985 is 58907821.
12870985 = 11302 + 11312 + ... + 11392.
It can be written as a sum of positive squares in 4 ways, for example, as 1901641 + 10969344 = 1379^2 + 3312^2 .
It is a sphenic number, since it is the product of 3 distinct primes.
It is a de Polignac number, because none of the positive numbers 2k-12870985 is a prime.
It is a Duffinian number.
It is an unprimeable number.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5145 + ... + 7225.
It is an arithmetic number, because the mean of its divisors is an integer number (1933137).
Almost surely, 212870985 is an apocalyptic number.
It is an amenable number.
12870985 is a deficient number, since it is larger than the sum of its proper divisors (2594111).
12870985 is a wasteful number, since it uses less digits than its factorization.
12870985 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 3323.
The product of its (nonzero) digits is 40320, while the sum is 40.
The square root of 12870985 is about 3587.6155033671. The cubic root of 12870985 is about 234.3530417354.
The spelling of 12870985 in words is "twelve million, eight hundred seventy thousand, nine hundred eighty-five".
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