124639 has 4 divisors (see below), whose sum is σ = 125856. Its totient is φ = 123424.

The previous prime is 124633. The next prime is 124643. The reversal of 124639 is 936421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 936421 = 311 ⋅3011.

It is a cyclic number.

It is not a de Polignac number, because 124639 - 2¹³ = 116447 is a prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 1 + 2³ + 6² + 4⁸ + 3¹⁰ + 9 .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (124633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 439 + ... + 664.

It is an arithmetic number, because the mean of its divisors is an integer number (31464).

2¹²⁴⁶³⁹ is an apocalyptic number.

124639 is a deficient number, since it is larger than the sum of its proper divisors (1217).

124639 is a wasteful number, since it uses less digits than its factorization.

124639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1216.

The product of its digits is 1296, while the sum is 25.

The square root of 124639 is about 353.0424903606. The cubic root of 124639 is about 49.9518202558.

The spelling of 124639 in words is "one hundred twenty-four thousand, six hundred thirty-nine".