3139865 has 4 divisors (see below), whose sum is σ = 3767844. Its totient is φ = 2511888.

The previous prime is 3139861. The next prime is 3139867. The reversal of 3139865 is 5689313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5689313 = 7 ⋅812759.

It can be written as a sum of positive squares in 2 ways, for example, as 2085136 + 1054729 = 1444^2 + 1027^2 .

It is a cyclic number.

It is not a de Polignac number, because 3139865 - 2² = 3139861 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3139861) 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, 313982 + ... + 313991.

It is an arithmetic number, because the mean of its divisors is an integer number (941961).

Almost surely, 2^3139865 is an apocalyptic number.

It is an amenable number.

3139865 is a deficient number, since it is larger than the sum of its proper divisors (627979).

3139865 is an equidigital number, since it uses as much as digits as its factorization.

3139865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627978.

The product of its digits is 19440, while the sum is 35.

The square root of 3139865 is about 1771.9664218038. The cubic root of 3139865 is about 146.4323364376.

It can be divided in two parts, 3139 and 865, that added together give a palindrome (4004).

The spelling of 3139865 in words is "three million, one hundred thirty-nine thousand, eight hundred sixty-five".