123929 has 4 divisors (see below), whose sum is σ = 133476. Its totient is φ = 114384.

The previous prime is 123923. The next prime is 123931. The reversal of 123929 is 929321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 929321 = 389 ⋅2389.

It can be written as a sum of positive squares in 2 ways, for example, as 19600 + 104329 = 140^2 + 323^2 .

It is a cyclic number.

It is not a de Polignac number, because 123929 - 2¹⁶ = 58393 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 123898 and 123907.

It is not an unprimeable number, because it can be changed into a prime (123923) 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, 4754 + ... + 4779.

It is an arithmetic number, because the mean of its divisors is an integer number (33369).

2¹²³⁹²⁹ is an apocalyptic number.

It is an amenable number.

123929 is a deficient number, since it is larger than the sum of its proper divisors (9547).

123929 is an equidigital number, since it uses as much as digits as its factorization.

123929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9546.

The product of its digits is 972, while the sum is 26.

The square root of 123929 is about 352.0355095725. The cubic root of 123929 is about 49.8567902107.

The spelling of 123929 in words is "one hundred twenty-three thousand, nine hundred twenty-nine".