3138865 has 4 divisors (see below), whose sum is σ = 3766644. Its totient is φ = 2511088.

The previous prime is 3138853. The next prime is 3138869. The reversal of 3138865 is 5688313.

It is a happy number.

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 524176 + 2614689 = 724^2 + 1617^2 .

It is a cyclic number.

It is not a de Polignac number, because 3138865 - 2¹¹ = 3136817 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 3138865.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3138869) 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, 313882 + ... + 313891.

It is an arithmetic number, because the mean of its divisors is an integer number (941661).

Almost surely, 2^3138865 is an apocalyptic number.

It is an amenable number.

3138865 is a deficient number, since it is larger than the sum of its proper divisors (627779).

3138865 is an equidigital number, since it uses as much as digits as its factorization.

3138865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627778.

The product of its digits is 17280, while the sum is 34.

The square root of 3138865 is about 1771.6842269434. The cubic root of 3138865 is about 146.4167892846.

The spelling of 3138865 in words is "three million, one hundred thirty-eight thousand, eight hundred sixty-five".