3816861 has 4 divisors (see below), whose sum is σ = 5089152. Its totient is φ = 2544572.

The previous prime is 3816847. The next prime is 3816863. The reversal of 3816861 is 1686183.

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 3816861 - 2⁷ = 3816733 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 (3816863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 636141 + ... + 636146.

It is an arithmetic number, because the mean of its divisors is an integer number (1272288).

Almost surely, 2^3816861 is an apocalyptic number.

It is an amenable number.

3816861 is a deficient number, since it is larger than the sum of its proper divisors (1272291).

3816861 is a wasteful number, since it uses less digits than its factorization.

3816861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1272290.

The product of its digits is 6912, while the sum is 33.

The square root of 3816861 is about 1953.6788374756. The cubic root of 3816861 is about 156.2795366029.

It can be divided in two parts, 381 and 6861, that multiplied together give a triangular number (2614041 = T₂₂₈₆).

The spelling of 3816861 in words is "three million, eight hundred sixteen thousand, eight hundred sixty-one".