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30956 = 2271109
BaseRepresentation
bin111100011101100
31120110112
413203230
51442311
6355152
7156152
oct74354
946415
1030956
1121292
1215ab8
1311123
14b3d2
15928b
hex78ec

30956 has 12 divisors (see below), whose sum is σ = 55440. Its totient is φ = 15120.

The previous prime is 30949. The next prime is 30971. The reversal of 30956 is 65903.

It can be divided in two parts, 30 and 956, that multiplied together give a triangular number (28680 = T239).

It is a plaindrome in base 13.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230 + ... + 338.

It is an arithmetic number, because the mean of its divisors is an integer number (4620).

230956 is an apocalyptic number.

It is an amenable number.

30956 is a deficient number, since it is larger than the sum of its proper divisors (24484).

30956 is a wasteful number, since it uses less digits than its factorization.

30956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184 (or 182 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 23.

The square root of 30956 is about 175.9431726439. The cubic root of 30956 is about 31.3989370406.

The spelling of 30956 in words is "thirty thousand, nine hundred fifty-six".

Divisors: 1 2 4 71 109 142 218 284 436 7739 15478 30956