3861591 has 4 divisors (see below), whose sum is σ = 5148792. Its totient is φ = 2574392.

The previous prime is 3861589. The next prime is 3861593. The reversal of 3861591 is 1951683.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (3861589) and next prime (3861593).

It is a cyclic number.

It is not a de Polignac number, because 3861591 - 2¹ = 3861589 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 (3861593) 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, 643596 + ... + 643601.

It is an arithmetic number, because the mean of its divisors is an integer number (1287198).

Almost surely, 2^3861591 is an apocalyptic number.

3861591 is a deficient number, since it is larger than the sum of its proper divisors (1287201).

3861591 is a wasteful number, since it uses less digits than its factorization.

3861591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1287200.

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

The square root of 3861591 is about 1965.0931275642. The cubic root of 3861591 is about 156.8876500225.

The spelling of 3861591 in words is "three million, eight hundred sixty-one thousand, five hundred ninety-one".