124240005 has 12 divisors (see below), whose sum is σ = 215349420. Its totient is φ = 66261312.

The previous prime is 124240001. The next prime is 124240009. The reversal of 124240005 is 500042421.

It is an interprime number because it is at equal distance from previous prime (124240001) and next prime (124240009).

It can be written as a sum of positive squares in 2 ways, for example, as 81703521 + 42536484 = 9039^2 + 6522^2 .

It is not a de Polignac number, because 124240005 - 2² = 124240001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 124240005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (124240001) 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 11 ways as a sum of consecutive naturals, for example, 1380400 + ... + 1380489.

It is an arithmetic number, because the mean of its divisors is an integer number (17945785).

Almost surely, 2^124240005 is an apocalyptic number.

124240005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

124240005 is a deficient number, since it is larger than the sum of its proper divisors (91109415).

124240005 is a wasteful number, since it uses less digits than its factorization.

124240005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2760900 (or 2760897 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 124240005 is about 11146.3000587639. The cubic root of 124240005 is about 498.9846127065.

Adding to 124240005 its reverse (500042421), we get a palindrome (624282426).

The spelling of 124240005 in words is "one hundred twenty-four million, two hundred forty thousand, five".