123779 has 4 divisors (see below), whose sum is σ = 126840. Its totient is φ = 120720.

The previous prime is 123757. The next prime is 123787. The reversal of 123779 is 977321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 977321 = 367 ⋅2663.

It is a cyclic number.

It is not a de Polignac number, because 123779 - 2¹⁶ = 58243 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10 and base 13.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (123719) 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, 1469 + ... + 1550.

It is an arithmetic number, because the mean of its divisors is an integer number (31710).

2¹²³⁷⁷⁹ is an apocalyptic number.

123779 is a deficient number, since it is larger than the sum of its proper divisors (3061).

123779 is an equidigital number, since it uses as much as digits as its factorization.

123779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3060.

The product of its digits is 2646, while the sum is 29.

The square root of 123779 is about 351.8223983774. The cubic root of 123779 is about 49.8366670278.

The spelling of 123779 in words is "one hundred twenty-three thousand, seven hundred seventy-nine".