124006405 has 4 divisors (see below), whose sum is σ = 148807692. Its totient is φ = 99205120.

The previous prime is 124006403. The next prime is 124006423. The reversal of 124006405 is 504600421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25877569 + 98128836 = 5087^2 + 9906^2 .

It is not a de Polignac number, because 124006405 - 2¹ = 124006403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (124006403) 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, 12400636 + ... + 12400645.

It is an arithmetic number, because the mean of its divisors is an integer number (37201923).

Almost surely, 2^124006405 is an apocalyptic number.

It is an amenable number.

124006405 is a deficient number, since it is larger than the sum of its proper divisors (24801287).

124006405 is an equidigital number, since it uses as much as digits as its factorization.

124006405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24801286.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 124006405 is about 11135.8163149362. The cubic root of 124006405 is about 498.6716809285.

Adding to 124006405 its reverse (504600421), we get a palindrome (628606826).

The spelling of 124006405 in words is "one hundred twenty-four million, six thousand, four hundred five".