30915 has 16 divisors (see below), whose sum is σ = 55200. Its totient is φ = 16416.
The previous prime is 30911. The next prime is 30931. The reversal of 30915 is 51903.
It is not a de Polignac number, because 30915 - 22 = 30911 is a prime.
30915 is a lucky number.
It is a zygodrome in base 2.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (30911) 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, 21 + ... + 249.
It is an arithmetic number, because the mean of its divisors is an integer number (3450).
230915 is an apocalyptic number.
30915 is a deficient number, since it is larger than the sum of its proper divisors (24285).
30915 is a wasteful number, since it uses less digits than its factorization.
30915 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 243 (or 237 counting only the distinct ones).
The product of its (nonzero) digits is 135, while the sum is 18.
The square root of 30915 is about 175.8266191451. The cubic root of 30915 is about 31.3850686985.
It can be divided in two parts, 309 and 15, that added together give a square (324 = 182).
The spelling of 30915 in words is "thirty thousand, nine hundred fifteen".
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