3861947 has 4 divisors (see below), whose sum is σ = 3919656. Its totient is φ = 3804240.

The previous prime is 3861929. The next prime is 3861961. The reversal of 3861947 is 7491683.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7491683 = 139 ⋅53897.

It is a cyclic number.

It is not a de Polignac number, because 3861947 - 2¹⁴ = 3845563 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3861947.

It is not an unprimeable number, because it can be changed into a prime (3861967) 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, 28754 + ... + 28887.

It is an arithmetic number, because the mean of its divisors is an integer number (979914).

Almost surely, 2^3861947 is an apocalyptic number.

3861947 is a deficient number, since it is larger than the sum of its proper divisors (57709).

3861947 is an equidigital number, since it uses as much as digits as its factorization.

3861947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57708.

The product of its digits is 36288, while the sum is 38.

The square root of 3861947 is about 1965.1837064254. The cubic root of 3861947 is about 156.8924710308.

The spelling of 3861947 in words is "three million, eight hundred sixty-one thousand, nine hundred forty-seven".