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30885 = 352971
BaseRepresentation
bin111100010100101
31120100220
413202211
51442020
6354553
7156021
oct74245
946326
1030885
1121228
1215a59
131109a
14b381
159240
hex78a5

30885 has 16 divisors (see below), whose sum is σ = 51840. Its totient is φ = 15680.

The previous prime is 30881. The next prime is 30893. The reversal of 30885 is 58803.

30885 = 512 + 522 + ... + 602.

It is not a de Polignac number, because 30885 - 22 = 30881 is a prime.

30885 is a lucky number.

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 30885.

It is not an unprimeable number, because it can be changed into a prime (30881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 400 + ... + 470.

It is an arithmetic number, because the mean of its divisors is an integer number (3240).

230885 is an apocalyptic number.

It is an amenable number.

30885 is a deficient number, since it is larger than the sum of its proper divisors (20955).

30885 is a wasteful number, since it uses less digits than its factorization.

30885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 30885 is about 175.7412871240. The cubic root of 30885 is about 31.3749133609.

It can be divided in two parts, 308 and 85, that added together give a palindrome (393).

The spelling of 30885 in words is "thirty thousand, eight hundred eighty-five".

Divisors: 1 3 5 15 29 71 87 145 213 355 435 1065 2059 6177 10295 30885