123019 has 4 divisors (see below), whose sum is σ = 132496. Its totient is φ = 113544.

The previous prime is 123017. The next prime is 123031. The reversal of 123019 is 910321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 910321 = 397 ⋅2293.

It is a cyclic number.

It is not a de Polignac number, because 123019 - 2¹ = 123017 is a prime.

It is a super-2 number, since 2×123019² = 30267348722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 122993 and 123011.

It is not an unprimeable number, because it can be changed into a prime (123017) 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, 4719 + ... + 4744.

It is an arithmetic number, because the mean of its divisors is an integer number (33124).

2¹²³⁰¹⁹ is an apocalyptic number.

123019 is the 203-rd hex number.

123019 is a deficient number, since it is larger than the sum of its proper divisors (9477).

123019 is an equidigital number, since it uses as much as digits as its factorization.

123019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9476.

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

The square root of 123019 is about 350.7406449216. The cubic root of 123019 is about 49.7344589219.

The spelling of 123019 in words is "one hundred twenty-three thousand, nineteen".