Base | Representation |
---|---|
bin | 111010000111… |
… | …1101011010111 |
3 | 2010100011222122 |
4 | 1310033223113 |
5 | 30300113134 |
6 | 3005050155 |
7 | 520005221 |
oct | 164175327 |
9 | 63304878 |
10 | 30472919 |
11 | 16223834 |
12 | a25695b |
13 | 640c319 |
14 | 4093411 |
15 | 2a1e02e |
hex | 1d0fad7 |
30472919 has 2 divisors, whose sum is σ = 30472920. Its totient is φ = 30472918.
The previous prime is 30472889. The next prime is 30472943. The reversal of 30472919 is 91927403.
It is a strong prime.
It is an emirp because it is prime and its reverse (91927403) is a distict prime.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-30472919 is a prime.
It is a super-2 number, since 2×304729192 = 1857197584761122, which contains 22 as substring.
It is a Chen prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (30472319) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15236459 + 15236460.
It is an arithmetic number, because the mean of its divisors is an integer number (15236460).
Almost surely, 230472919 is an apocalyptic number.
30472919 is a deficient number, since it is larger than the sum of its proper divisors (1).
30472919 is an equidigital number, since it uses as much as digits as its factorization.
30472919 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 13608, while the sum is 35.
The square root of 30472919 is about 5520.2281655743. The cubic root of 30472919 is about 312.3474891015.
The spelling of 30472919 in words is "thirty million, four hundred seventy-two thousand, nine hundred nineteen".
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