123740605 has 4 divisors (see below), whose sum is σ = 148488732. Its totient is φ = 98992480.

The previous prime is 123740587. The next prime is 123740611. The reversal of 123740605 is 506047321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 506047321 = 13 ⋅38926717.

It can be written as a sum of positive squares in 2 ways, for example, as 15705369 + 108035236 = 3963^2 + 10394^2 .

It is not a de Polignac number, because 123740605 - 2¹¹ = 123738557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 12374056 + ... + 12374065.

It is an arithmetic number, because the mean of its divisors is an integer number (37122183).

Almost surely, 2^123740605 is an apocalyptic number.

It is an amenable number.

123740605 is a deficient number, since it is larger than the sum of its proper divisors (24748127).

123740605 is an equidigital number, since it uses as much as digits as its factorization.

123740605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24748126.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 123740605 is about 11123.8754487813. The cubic root of 123740605 is about 498.3151355072.

Adding to 123740605 its reverse (506047321), we get a palindrome (629787926).

The spelling of 123740605 in words is "one hundred twenty-three million, seven hundred forty thousand, six hundred five".