3861647 has 4 divisors (see below), whose sum is σ = 3866016. Its totient is φ = 3857280.

The previous prime is 3861607. The next prime is 3861659. The reversal of 3861647 is 7461683.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 3861647 - 2¹⁴ = 3845263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3861607) 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, 338 + ... + 2799.

It is an arithmetic number, because the mean of its divisors is an integer number (966504).

Almost surely, 2^3861647 is an apocalyptic number.

3861647 is a deficient number, since it is larger than the sum of its proper divisors (4369).

3861647 is a wasteful number, since it uses less digits than its factorization.

3861647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4368.

The product of its digits is 24192, while the sum is 35.

The square root of 3861647 is about 1965.1073762011. The cubic root of 3861647 is about 156.8884084030. Note that the first 3 decimals are identical.

The spelling of 3861647 in words is "three million, eight hundred sixty-one thousand, six hundred forty-seven".