Search a number
-
+
30979 = 132383
BaseRepresentation
bin111100100000011
31120111101
413210003
51442404
6355231
7156214
oct74403
946441
1030979
1121303
1215b17
1311140
14b40b
1592a4
hex7903

30979 has 4 divisors (see below), whose sum is σ = 33376. Its totient is φ = 28584.

The previous prime is 30977. The next prime is 30983. The reversal of 30979 is 97903.

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 30979 - 21 = 30977 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1179 + ... + 1204.

It is an arithmetic number, because the mean of its divisors is an integer number (8344).

230979 is an apocalyptic number.

30979 is a deficient number, since it is larger than the sum of its proper divisors (2397).

30979 is a wasteful number, since it uses less digits than its factorization.

30979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2396.

The product of its (nonzero) digits is 1701, while the sum is 28.

The square root of 30979 is about 176.0085225209. The cubic root of 30979 is about 31.4067114814.

The spelling of 30979 in words is "thirty thousand, nine hundred seventy-nine".

Divisors: 1 13 2383 30979