124809 has 4 divisors (see below), whose sum is σ = 166416. Its totient is φ = 83204.

The previous prime is 124799. The next prime is 124819. The reversal of 124809 is 908421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (124799) and next prime (124819).

It is a cyclic number.

It is not a de Polignac number, because 124809 - 2⁴ = 124793 is a prime.

It is a D-number.

It is a plaindrome in base 14.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 124809.

It is not an unprimeable number, because it can be changed into a prime (124819) 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, 20799 + ... + 20804.

It is an arithmetic number, because the mean of its divisors is an integer number (41604).

2¹²⁴⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

124809 is a deficient number, since it is larger than the sum of its proper divisors (41607).

124809 is an equidigital number, since it uses as much as digits as its factorization.

124809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41606.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 124809 is about 353.2831725401. The cubic root of 124809 is about 49.9745203513.

The spelling of 124809 in words is "one hundred twenty-four thousand, eight hundred nine".