123730405 has 8 divisors (see below), whose sum is σ = 152489592. Its totient is φ = 96308928.

The previous prime is 123730379. The next prime is 123730421. The reversal of 123730405 is 504037321.

It can be written as a sum of positive squares in 4 ways, for example, as 34597924 + 89132481 = 5882^2 + 9441^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 123730405 - 2¹⁹ = 123206117 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123730405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 334222 + ... + 334591.

It is an arithmetic number, because the mean of its divisors is an integer number (19061199).

Almost surely, 2^123730405 is an apocalyptic number.

It is an amenable number.

123730405 is a deficient number, since it is larger than the sum of its proper divisors (28759187).

123730405 is an equidigital number, since it uses as much as digits as its factorization.

123730405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668855.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 123730405 is about 11123.4169660226. The cubic root of 123730405 is about 498.3014430090.

Adding to 123730405 its reverse (504037321), we get a palindrome (627767726).

The spelling of 123730405 in words is "one hundred twenty-three million, seven hundred thirty thousand, four hundred five".