124840 has 16 divisors (see below), whose sum is σ = 280980. Its totient is φ = 49920.

The previous prime is 124823. The next prime is 124847. The reversal of 124840 is 48421.

It can be written as a sum of positive squares in 2 ways, for example, as 101124 + 23716 = 318^2 + 154^2 .

It is not an unprimeable number, because it can be changed into a prime (124847) 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, 1521 + ... + 1600.

2¹²⁴⁸⁴⁰ is an apocalyptic number.

124840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

124840 is an abundant number, since it is smaller than the sum of its proper divisors (156140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

124840 is a wasteful number, since it uses less digits than its factorization.

124840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3132 (or 3128 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 124840 is about 353.3270439692. The cubic root of 124840 is about 49.9786575580.

The spelling of 124840 in words is "one hundred twenty-four thousand, eight hundred forty".