30855 has 24 divisors (see below), whose sum is σ = 57456. Its totient is φ = 14080.

The previous prime is 30853. The next prime is 30859. The reversal of 30855 is 55803.

30855 = T₂ + T₃ + ... + T₅₆.

30855 is nontrivially palindromic in base 16.

30855 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 30855 - 2¹ = 30853 is a prime.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30851) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1807 + ... + 1823.

It is an arithmetic number, because the mean of its divisors is an integer number (2394).

2³⁰⁸⁵⁵ is an apocalyptic number.

30855 is a deficient number, since it is larger than the sum of its proper divisors (26601).

30855 is a wasteful number, since it uses less digits than its factorization.

30855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47 (or 36 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 30855 is about 175.6559136494. The cubic root of 30855 is about 31.3647514450.

Adding to 30855 its sum of digits (21), we get a triangular number (30876 = T₂₄₈).

It can be divided in two parts, 308 and 55, that added together give a palindrome (363).

The spelling of 30855 in words is "thirty thousand, eight hundred fifty-five".