165923 has 4 divisors (see below), whose sum is σ = 166800. Its totient is φ = 165048.

The previous prime is 165901. The next prime is 165931. The reversal of 165923 is 329561.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 329561 = 31 ⋅10631.

It is a cyclic number.

It is not a de Polignac number, because 165923 - 2⁸ = 165667 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 165892 and 165901.

It is not an unprimeable number, because it can be changed into a prime (165983) 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, 23 + ... + 576.

It is an arithmetic number, because the mean of its divisors is an integer number (41700).

2¹⁶⁵⁹²³ is an apocalyptic number.

165923 is a deficient number, since it is larger than the sum of its proper divisors (877).

165923 is an equidigital number, since it uses as much as digits as its factorization.

165923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876.

The product of its digits is 1620, while the sum is 26.

The square root of 165923 is about 407.3364702552. The cubic root of 165923 is about 54.9501476647.

The spelling of 165923 in words is "one hundred sixty-five thousand, nine hundred twenty-three".