155923 has 4 divisors (see below), whose sum is σ = 159768. Its totient is φ = 152080.

The previous prime is 155921. The next prime is 156007. The reversal of 155923 is 329551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 155923 - 2¹ = 155921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1861 + ... + 1942.

It is an arithmetic number, because the mean of its divisors is an integer number (39942).

2¹⁵⁵⁹²³ is an apocalyptic number.

155923 is a deficient number, since it is larger than the sum of its proper divisors (3845).

155923 is an equidigital number, since it uses as much as digits as its factorization.

155923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3844.

The product of its digits is 1350, while the sum is 25.

The square root of 155923 is about 394.8708649673. The cubic root of 155923 is about 53.8232676681.

The spelling of 155923 in words is "one hundred fifty-five thousand, nine hundred twenty-three".