19123 has 4 divisors (see below), whose sum is σ = 20608. Its totient is φ = 17640.

The previous prime is 19121. The next prime is 19139. The reversal of 19123 is 32191.

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 19123 - 2¹ = 19121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19097 and 19106.

It is not an unprimeable number, because it can be changed into a prime (19121) 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, 723 + ... + 748.

It is an arithmetic number, because the mean of its divisors is an integer number (5152).

2¹⁹¹²³ is an apocalyptic number.

19123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

19123 is a deficient number, since it is larger than the sum of its proper divisors (1485).

19123 is a wasteful number, since it uses less digits than its factorization.

19123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1484.

The product of its digits is 54, while the sum is 16.

The square root of 19123 is about 138.2859356551. The cubic root of 19123 is about 26.7414739765.

The spelling of 19123 in words is "nineteen thousand, one hundred twenty-three".