3864861 has 72 divisors (see below), whose sum is σ = 7788480. Its totient is φ = 1853280.

The previous prime is 3864841. The next prime is 3864871. The reversal of 3864861 is 1684683.

It is a happy number.

3864861 is a `hidden beast` number, since 3 + 8 + 648 + 6 + 1 = 666.

It is not a de Polignac number, because 3864861 - 2⁵ = 3864829 is a prime.

Its product of digits (27648) is a multiple of the sum of its prime factors (64).

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3864811) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 297291 + ... + 297303.

Almost surely, 2^3864861 is an apocalyptic number.

It is an amenable number.

3864861 is an abundant number, since it is smaller than the sum of its proper divisors (3923619).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3864861 is a wasteful number, since it uses less digits than its factorization.

3864861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64 (or 34 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 3864861 is about 1965.9249731361. The cubic root of 3864861 is about 156.9319217466.

The spelling of 3864861 in words is "three million, eight hundred sixty-four thousand, eight hundred sixty-one".