Search a number
-
+
30947 = 74421
BaseRepresentation
bin111100011100011
31120110012
413203203
51442242
6355135
7156140
oct74343
946405
1030947
1121284
1215aab
1311117
14b3c7
159282
hex78e3

30947 has 4 divisors (see below), whose sum is σ = 35376. Its totient is φ = 26520.

The previous prime is 30941. The next prime is 30949. The reversal of 30947 is 74903.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 30947 - 24 = 30931 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a plaindrome in base 12 and base 13.

It is a zygodrome in base 2.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 30947.

It is not an unprimeable number, because it can be changed into a prime (30941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2204 + ... + 2217.

It is an arithmetic number, because the mean of its divisors is an integer number (8844).

230947 is an apocalyptic number.

30947 is a deficient number, since it is larger than the sum of its proper divisors (4429).

30947 is an equidigital number, since it uses as much as digits as its factorization.

30947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4428.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 30947 is about 175.9175943446. The cubic root of 30947 is about 31.3958938198.

Subtracting 30947 from its reverse (74903), we obtain a triangular number (43956 = T296).

The spelling of 30947 in words is "thirty thousand, nine hundred forty-seven".

Divisors: 1 7 4421 30947