3138605 has 4 divisors (see below), whose sum is σ = 3766332. Its totient is φ = 2510880.

The previous prime is 3138601. The next prime is 3138637. The reversal of 3138605 is 5068313.

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 2019241 + 1119364 = 1421^2 + 1058^2 .

It is not a de Polignac number, because 3138605 - 2² = 3138601 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3138601) by changing a digit.

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, 313856 + ... + 313865.

It is an arithmetic number, because the mean of its divisors is an integer number (941583).

Almost surely, 2^3138605 is an apocalyptic number.

It is an amenable number.

3138605 is a deficient number, since it is larger than the sum of its proper divisors (627727).

3138605 is an equidigital number, since it uses as much as digits as its factorization.

3138605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627726.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 3138605 is about 1771.6108489169. The cubic root of 3138605 is about 146.4127464839.

The spelling of 3138605 in words is "three million, one hundred thirty-eight thousand, six hundred five".