123979 has 2 divisors, whose sum is σ = 123980. Its totient is φ = 123978.

The previous prime is 123973. The next prime is 123983. The reversal of 123979 is 979321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123979 - 2¹¹ = 121931 is a prime.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 123979.

It is not a weakly prime, because it can be changed into another prime (123973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61989 + 61990.

It is an arithmetic number, because the mean of its divisors is an integer number (61990).

2¹²³⁹⁷⁹ is an apocalyptic number.

123979 is a deficient number, since it is larger than the sum of its proper divisors (1).

123979 is an equidigital number, since it uses as much as digits as its factorization.

123979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3402, while the sum is 31.

The square root of 123979 is about 352.1065179743. The cubic root of 123979 is about 49.8634943299.

The spelling of 123979 in words is "one hundred twenty-three thousand, nine hundred seventy-nine".