124009 has 4 divisors (see below), whose sum is σ = 124740. Its totient is φ = 123280.

The previous prime is 124001. The next prime is 124021. The reversal of 124009 is 900421.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 21609 + 102400 = 147^2 + 320^2 .

It is a cyclic number.

It is not a de Polignac number, because 124009 - 2³ = 124001 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123983 and 124001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (124001) 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, 39 + ... + 499.

It is an arithmetic number, because the mean of its divisors is an integer number (31185).

2¹²⁴⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

124009 is a deficient number, since it is larger than the sum of its proper divisors (731).

124009 is an equidigital number, since it uses as much as digits as its factorization.

124009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 124009 is about 352.1491161426. The cubic root of 124009 is about 49.8675159362.

The spelling of 124009 in words is "one hundred twenty-four thousand, nine".