124240 has 20 divisors (see below), whose sum is σ = 289044. Its totient is φ = 49664.

The previous prime is 124231. The next prime is 124247. The reversal of 124240 is 42421.

It can be written as a sum of positive squares in 2 ways, for example, as 26896 + 97344 = 164^2 + 312^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 124240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (124247) 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, 697 + ... + 856.

2¹²⁴²⁴⁰ is an apocalyptic number.

124240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

124240 is an abundant number, since it is smaller than the sum of its proper divisors (164804).

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

124240 is a wasteful number, since it uses less digits than its factorization.

124240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1566 (or 1560 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 124240 is about 352.4769496010. The cubic root of 124240 is about 49.8984606013.

Adding to 124240 its reverse (42421), we get a palindrome (166661).

The spelling of 124240 in words is "one hundred twenty-four thousand, two hundred forty", and thus it is an iban number.