Base | Representation |
---|---|
bin | 100010111010… |
… | …0010001001111 |
3 | 1021102211200000 |
4 | 1011310101033 |
5 | 14141131111 |
6 | 1452135343 |
7 | 311364456 |
oct | 105642117 |
9 | 37384600 |
10 | 18302031 |
11 | a370650 |
12 | 6167553 |
13 | 3a3a607 |
14 | 2605b9d |
15 | 1917c56 |
hex | 117444f |
18302031 has 48 divisors (see below), whose sum is σ = 30820608. Its totient is φ = 10756800.
The previous prime is 18302023. The next prime is 18302033. The reversal of 18302031 is 13020381.
It is not a de Polignac number, because 18302031 - 23 = 18302023 is a prime.
It is a super-2 number, since 2×183020312 = 669928677449922, which contains 22 as substring.
It is a junction number, because it is equal to n+sod(n) for n = 18301995 and 18302013.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (18302033) by changing a digit.
It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 109510 + ... + 109676.
It is an arithmetic number, because the mean of its divisors is an integer number (642096).
Almost surely, 218302031 is an apocalyptic number.
18302031 is a gapful number since it is divisible by the number (11) formed by its first and last digit.
18302031 is the 2706-th heptagonal number.
18302031 is a deficient number, since it is larger than the sum of its proper divisors (12518577).
18302031 is a wasteful number, since it uses less digits than its factorization.
18302031 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 234 (or 222 counting only the distinct ones).
The product of its (nonzero) digits is 144, while the sum is 18.
The square root of 18302031 is about 4278.0873062620. The cubic root of 18302031 is about 263.5318407442.
The spelling of 18302031 in words is "eighteen million, three hundred two thousand, thirty-one".
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