123919 has 4 divisors (see below), whose sum is σ = 125496. Its totient is φ = 122344.

The previous prime is 123911. The next prime is 123923. The reversal of 123919 is 919321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 919321 = 13 ⋅70717.

It is a cyclic number.

It is not a de Polignac number, because 123919 - 2³ = 123911 is a prime.

It is a super-2 number, since 2×123919² = 30711837122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 123893 and 123902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123911) 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, 664 + ... + 829.

It is an arithmetic number, because the mean of its divisors is an integer number (31374).

2¹²³⁹¹⁹ is an apocalyptic number.

123919 is a deficient number, since it is larger than the sum of its proper divisors (1577).

123919 is an equidigital number, since it uses as much as digits as its factorization.

123919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1576.

The product of its digits is 486, while the sum is 25.

The square root of 123919 is about 352.0213061734. The cubic root of 123919 is about 49.8554491705.

The spelling of 123919 in words is "one hundred twenty-three thousand, nine hundred nineteen".