3861409 has 4 divisors (see below), whose sum is σ = 3908016. Its totient is φ = 3814804.

The previous prime is 3861383. The next prime is 3861413. The reversal of 3861409 is 9041683.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9041683 = 7 ⋅1291669.

It is a cyclic number.

It is not a de Polignac number, because 3861409 - 2¹⁹ = 3337121 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

3861409 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3861419) 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, 23179 + ... + 23344.

It is an arithmetic number, because the mean of its divisors is an integer number (977004).

Almost surely, 2^3861409 is an apocalyptic number.

It is an amenable number.

3861409 is a deficient number, since it is larger than the sum of its proper divisors (46607).

3861409 is an equidigital number, since it uses as much as digits as its factorization.

3861409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46606.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 3861409 is about 1965.0468187807. The cubic root of 3861409 is about 156.8851852352.

The spelling of 3861409 in words is "three million, eight hundred sixty-one thousand, four hundred nine".