123540605 has 8 divisors (see below), whose sum is σ = 148310232. Its totient is φ = 98791488.

The previous prime is 123540589. The next prime is 123540617. The reversal of 123540605 is 506045321.

It can be written as a sum of positive squares in 4 ways, for example, as 16273156 + 107267449 = 4034^2 + 10357^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 123540605 - 2⁴ = 123540589 is a prime.

It is a Duffinian number.

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, 16199 + ... + 22571.

It is an arithmetic number, because the mean of its divisors is an integer number (18538779).

Almost surely, 2^123540605 is an apocalyptic number.

It is an amenable number.

123540605 is a deficient number, since it is larger than the sum of its proper divisors (24769627).

123540605 is an equidigital number, since it uses as much as digits as its factorization.

123540605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10255.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 123540605 is about 11114.8821406257. The cubic root of 123540605 is about 498.0465177538.

Adding to 123540605 its reverse (506045321), we get a palindrome (629585926).

The spelling of 123540605 in words is "one hundred twenty-three million, five hundred forty thousand, six hundred five".