123969 has 12 divisors (see below), whose sum is σ = 174768. Its totient is φ = 78120.

The previous prime is 123953. The next prime is 123973. The reversal of 123969 is 969321.

It is not a de Polignac number, because 123969 - 2⁴ = 123953 is a prime.

It is a super-2 number, since 2×123969² = 30736625922, which contains 22 as substring.

Its product of digits (2916) is a multiple of the sum of its prime factors (108).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (123979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2862 + ... + 2904.

It is an arithmetic number, because the mean of its divisors is an integer number (14564).

2¹²³⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

123969 is a deficient number, since it is larger than the sum of its proper divisors (50799).

123969 is an equidigital number, since it uses as much as digits as its factorization.

123969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108 (or 77 counting only the distinct ones).

The product of its digits is 2916, while the sum is 30.

The square root of 123969 is about 352.0923174396. The cubic root of 123969 is about 49.8621536503.

It can be divided in two parts, 1239 and 69, that multiplied together give a triangular number (85491 = T₄₁₃).

The spelling of 123969 in words is "one hundred twenty-three thousand, nine hundred sixty-nine".