155823 has 4 divisors (see below), whose sum is σ = 207768. Its totient is φ = 103880.

The previous prime is 155821. The next prime is 155833. The reversal of 155823 is 328551.

155823 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 328551 = 3 ⋅109517.

It is a cyclic number.

It is not a de Polignac number, because 155823 - 2¹ = 155821 is a prime.

It is a D-number.

155823 is a lucky number.

It is a plaindrome in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 155793 and 155802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155821) 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, 25968 + ... + 25973.

It is an arithmetic number, because the mean of its divisors is an integer number (51942).

2¹⁵⁵⁸²³ is an apocalyptic number.

155823 is a deficient number, since it is larger than the sum of its proper divisors (51945).

155823 is an equidigital number, since it uses as much as digits as its factorization.

155823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51944.

The product of its digits is 1200, while the sum is 24.

The square root of 155823 is about 394.7442209837. The cubic root of 155823 is about 53.8117588298.

The spelling of 155823 in words is "one hundred fifty-five thousand, eight hundred twenty-three".