Base | Representation |
---|---|
bin | 100011100100… |
… | …1001110000001 |
3 | 1022002111222012 |
4 | 1013021032001 |
5 | 14233244420 |
6 | 1503422305 |
7 | 314344064 |
oct | 107111601 |
9 | 38074865 |
10 | 18649985 |
11 | a589012 |
12 | 62b4995 |
13 | 3b2cac3 |
14 | 26968db |
15 | 1985dc5 |
hex | 11c9381 |
18649985 has 4 divisors (see below), whose sum is σ = 22379988. Its totient is φ = 14919984.
The previous prime is 18649979. The next prime is 18650041. The reversal of 18649985 is 58994681.
It is a happy number.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58994681 = 71 ⋅830911.
It can be written as a sum of positive squares in 2 ways, for example, as 10029889 + 8620096 = 3167^2 + 2936^2 .
It is a cyclic number.
It is not a de Polignac number, because 18649985 - 26 = 18649921 is a prime.
It is a Duffinian number.
It is an unprimeable number.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1864994 + ... + 1865003.
It is an arithmetic number, because the mean of its divisors is an integer number (5594997).
Almost surely, 218649985 is an apocalyptic number.
It is an amenable number.
18649985 is a deficient number, since it is larger than the sum of its proper divisors (3730003).
18649985 is an equidigital number, since it uses as much as digits as its factorization.
18649985 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 3730002.
The product of its digits is 622080, while the sum is 50.
The square root of 18649985 is about 4318.5628396493. The cubic root of 18649985 is about 265.1914363732.
The spelling of 18649985 in words is "eighteen million, six hundred forty-nine thousand, nine hundred eighty-five".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.070 sec. • engine limits •