3915861 has 4 divisors (see below), whose sum is σ = 5221152. Its totient is φ = 2610572.

The previous prime is 3915853. The next prime is 3915887. The reversal of 3915861 is 1685193.

3915861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 3915861 - 2³ = 3915853 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3915061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 652641 + ... + 652646.

It is an arithmetic number, because the mean of its divisors is an integer number (1305288).

Almost surely, 2^3915861 is an apocalyptic number.

It is an amenable number.

3915861 is a deficient number, since it is larger than the sum of its proper divisors (1305291).

3915861 is a wasteful number, since it uses less digits than its factorization.

3915861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1305290.

The product of its digits is 6480, while the sum is 33.

The square root of 3915861 is about 1978.8534559184. The cubic root of 3915861 is about 157.6191891955.

The spelling of 3915861 in words is "three million, nine hundred fifteen thousand, eight hundred sixty-one".