3123605 has 4 divisors (see below), whose sum is σ = 3748332. Its totient is φ = 2498880.

The previous prime is 3123599. The next prime is 3123611. The reversal of 3123605 is 5063213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5063213 = 41 ⋅123493.

It is an interprime number because it is at equal distance from previous prime (3123599) and next prime (3123611).

It can be written as a sum of positive squares in 2 ways, for example, as 1503076 + 1620529 = 1226^2 + 1273^2 .

It is not a de Polignac number, because 3123605 - 2⁶ = 3123541 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, 312356 + ... + 312365.

It is an arithmetic number, because the mean of its divisors is an integer number (937083).

Almost surely, 2^3123605 is an apocalyptic number.

It is an amenable number.

3123605 is a deficient number, since it is larger than the sum of its proper divisors (624727).

3123605 is an equidigital number, since it uses as much as digits as its factorization.

3123605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624726.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 3123605 is about 1767.3723433391. The cubic root of 3123605 is about 146.1791289808.

Adding to 3123605 its reverse (5063213), we get a palindrome (8186818).

The spelling of 3123605 in words is "three million, one hundred twenty-three thousand, six hundred five".