Base | Representation |
---|---|
bin | 111001111111… |
… | …0100111001101 |
3 | 2010012122002211 |
4 | 1303332213031 |
5 | 30240344041 |
6 | 3003350421 |
7 | 516264355 |
oct | 163764715 |
9 | 63178084 |
10 | 30403021 |
11 | 16186270 |
12 | a222411 |
13 | 63b656c |
14 | 4075b65 |
15 | 2a08481 |
hex | 1cfe9cd |
30403021 has 32 divisors (see below), whose sum is σ = 38016000. Its totient is φ = 23950080.
The previous prime is 30403013. The next prime is 30403039. The reversal of 30403021 is 12030403.
It is not a de Polignac number, because 30403021 - 23 = 30403013 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 30402992 and 30403010.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (30403091) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 152680 + ... + 152878.
It is an arithmetic number, because the mean of its divisors is an integer number (1188000).
Almost surely, 230403021 is an apocalyptic number.
It is an amenable number.
30403021 is a deficient number, since it is larger than the sum of its proper divisors (7612979).
30403021 is a wasteful number, since it uses less digits than its factorization.
30403021 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 289.
The product of its (nonzero) digits is 72, while the sum is 13.
The square root of 30403021 is about 5513.8934519992. The cubic root of 30403021 is about 312.1084880504.
Adding to 30403021 its reverse (12030403), we get a palindrome (42433424).
The spelling of 30403021 in words is "thirty million, four hundred three thousand, twenty-one".
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