123719 has 2 divisors, whose sum is σ = 123720. Its totient is φ = 123718.

The previous prime is 123707. The next prime is 123727. The reversal of 123719 is 917321.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123719 is a prime.

It is a super-2 number, since 2×123719² = 30612781922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 123694 and 123703.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61859 + 61860.

It is an arithmetic number, because the mean of its divisors is an integer number (61860).

2¹²³⁷¹⁹ is an apocalyptic number.

123719 is a deficient number, since it is larger than the sum of its proper divisors (1).

123719 is an equidigital number, since it uses as much as digits as its factorization.

123719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 378, while the sum is 23.

The square root of 123719 is about 351.7371177456. The cubic root of 123719 is about 49.8286132025.

The spelling of 123719 in words is "one hundred twenty-three thousand, seven hundred nineteen".