7855 has 4 divisors (see below), whose sum is σ = 9432.
Its totient is φ = 6280.
The previous prime is 7853. The next prime is 7867. The reversal of 7855 is 5587.
7855 is nontrivially palindromic in base 2.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5587 = 37 ⋅151.
It is not a de Polignac number, because 7855 - 21 = 7853 is a prime.
It is a Duffinian number.
7855 is a lucky number.
It is a plaindrome in base 12.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (7853) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 781 + ... + 790.
It is an arithmetic number, because the mean of its divisors is an integer number (2358).
27855 is an apocalyptic number.
7855 is a deficient number, since it is larger than the sum of its proper divisors (1577).
7855 is a wasteful number, since it uses less digits than its factorization.
7855 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1576.
The product of its digits is 1400, while the sum is 25.
The square root of 7855 is about 88.6284378741.
The cubic root of 7855 is about 19.8784291909.
The spelling of 7855 in words is "seven thousand, eight hundred fifty-five".